Switch from using PLATFORM_NAME to SDK selectors in WebCore, WebInspectorUI, WebKit, WebKit2
<http://webkit.org/b/139463>

Reviewed by Mark Rowe.

Source/JavaScriptCore:

* Configurations/JavaScriptCore.xcconfig:
- Simplify SECTORDER_FLAGS.

Source/WebCore:

Also remove all uses of SQLITE3_HEADER_SEARCH_PATHS and
WEBCORE_SQLITE3_HEADER_SEARCH_PATHS which were phased out in
r132859 and needed for Leopard.

* Configurations/Base.xcconfig:
- Only set GCC_ENABLE_OBJC_GC, GCC_MODEL_TUNING and TOOLCHAINS
  on OS X.
- Set GCC_OPTIMIZATION_LEVEL_normal based on SDK.
- Simplify SQLITE3_HEADER_SEARCH_PATHS.
* Configurations/DebugRelease.xcconfig:
- Only set MACOSX_DEPLOYMENT_TARGET and SDKROOT on OS X.
* Configurations/Version.xcconfig:
- Set SYSTEM_VERSION_PREFIX separately for iOS and OS X.
* Configurations/WebCore.xcconfig:
- Set EXPORTED_SYMBOLS_FILE_i386, EXPORTED_SYMBOLS_FILE_x86_64,
  FRAMEWORK_SEARCH_PATHS, INSTALL_PATH, DYLIB_INSTALL_NAME_BASE,
  OTHER_LDFLAGS, SECTORDER_FLAGS, NORMAL_WEBCORE_FRAMEWORKS_DIR,
  WEBCORE_FRAMEWORKS_DIR, NORMAL_PRODUCTION_FRAMEWORKS_DIR,
  PRODUCTION_FRAMEWORKS_DIR,
  JAVASCRIPTCORE_PRIVATE_HEADERS_DIR_Production and
  EXCLUDED_SOURCE_FILE_NAMES based on SDK.
- Make sure DYLIB_INSTALL_NAME_BASE and OTHER_LDFLAGS are
  overrideable by WebCoreTestSupport.xcconfig.
* Configurations/WebCoreTestSupport.xcconfig:
- Set PRIVATE_HEADERS_FOLDER_PATH_Production and
  INSTALL_PATH_Production based on SDK.
- Override SECT_ORDER_FLAGS from WebCore.xcconfig.

Source/WebInspectorUI:

* Configurations/Base.xcconfig:
- Only set TOOLCHAINS on OS X.
* Configurations/DebugRelease.xcconfig:
- Only set MACOSX_DEPLOYMENT_TARGET and SDKROOT on OS X.
* Configurations/Version.xcconfig:
- Set SYSTEM_VERSION_PREFIX separately for iOS and OS X.
* Configurations/WebInspectorUIFramework.xcconfig:
- Set NORMAL_PRODUCTION_FRAMEWORKS_DIR,
  PRODUCTION_FRAMEWORKS_DIR and
  JAVASCRIPTCORE_PRIVATE_HEADERS_DIR_Production by SDK.

Source/WebKit/mac:

* Configurations/Base.xcconfig:
- Only set GCC_ENABLE_OBJC_GC, GCC_MODEL_TUNING and TOOLCHAINS
  on OS X.
- Set GCC_OPTIMIZATION_LEVEL_normal based on SDK.
* Configurations/DebugRelease.xcconfig:
- Only set MACOSX_DEPLOYMENT_TARGET and SDKROOT on OS X.
- Set WEBKIT_SYSTEM_INTERFACE_LIBRARY based on SDK.
* Configurations/Version.xcconfig:
- Set SYSTEM_VERSION_PREFIX separately for iOS and OS X.
* Configurations/WebKitLegacy.xcconfig:
- Set EXCLUDED_SOURCE_FILE_NAMES, EXPORTED_SYMBOLS_FILE_x86_64,
  FRAMEWORK_SEARCH_PATHS, OTHER_CFLAGS, INSTALL_PATH,
  DYLIB_INSTALL_NAME_BASE, OTHER_LDFLAGS, SECTORDER_FLAGS,
  NORMAL_WEBKIT_LEGACY_FRAMEWORKS_DIR,
  WEBKIT_LEGACY_FRAMEWORKS_DIR, NORMAL_PRODUCTION_FRAMEWORKS_DIR,
  PRODUCTION_FRAMEWORKS_DIR, PRODUCTION_ROOT,
  WEBCORE_PRIVATE_HEADERS_DIR_Production and
  WEBKITSYSTEMINTERFACE_STATIC_LIBRARY_HEADERS_FOLDER_PATH_engineering
  based on SDK.
- Fix PRODUCTION_ROOT to actually be set properly.
- Simplify EXPORTED_SYMBOLS_FILE_i386.

* migrate-headers.sh:
- Get rid of unused WEBKIT2_FRAMEWORKS_DIR variable.
- Change WEBCORE_PRIVATE_HEADERS_DIR_macosx_Production to
  WEBCORE_PRIVATE_HEADERS_DIR_Production based on changes to
  WebKitLegacy.xcconfig.

Source/WebKit2:

* Configurations/All.xcconfig:
- Only set EXCLUDED_SOURCE_FILE_NAMES on iOS.
* Configurations/Base.xcconfig:
- Only set FRAMEWORK_CONTENT_DIRECTORY, GCC_ENABLE_OBJC_GC and
  TOOLCHAINS on OS X.
* Configurations/BaseLegacyProcess.xcconfig:
- Only set SKIP_INSTALL on iOS.
* Configurations/BaseTarget.xcconfig:
- Set WEBKIT_FRAMEWORKS_DIR and UMBRELLA_FRAMEWORKS_DIR based on
  SDK, and simply them.
* Configurations/BaseXPCService.xcconfig:
- Set INSTALL_PATH_ACTUAL_Normal based on SDK.
* Configurations/DebugRelease.xcconfig:
- Only set MACOSX_DEPLOYMENT_TARGET and SDKROOT on OS X.
- Set WEBKIT_SYSTEM_INTERFACE_LIBRARY based on SDK.
* Configurations/NetworkProcess.xcconfig:
- Only set EXCLUDED_SHIM_FILE_NAME and CODE_SIGN_ENTITLEMENTS on
  iOS.
* Configurations/NetworkService.Development.xcconfig:
- Set INFOPLIST_FILE based on SDK.
- Simplify CODE_SIGN_ENTITLEMENTS for iOS.
* Configurations/NetworkService.xcconfig:
- Set INFOPLIST_FILE based on SDK.
- Simplify CODE_SIGN_ENTITLEMENTS for iOS.
* Configurations/PluginProcess.xcconfig:
- Only set EXCLUDED_SHIM_FILE_NAME and SKIP_INSTALL on iOS.
* Configurations/PluginProcessShim.xcconfig:
- Set OTHER_LDFLAGS based on SDK.
* Configurations/PluginService.32.xcconfig:
- Only set VALID_ARCHS on OS X.
- Set OTHER_LDFLAGS based on platform-specific values.
- Only set SKIP_INSTALL on iOS.
* Configurations/PluginService.64.xcconfig:
- Set ARCHS based on SDK.
- Set OTHER_LDFLAGS based on platform-specific values.
- Only set SKIP_INSTALL on iOS.
* Configurations/PluginService.Development.xcconfig:
- Only set SKIP_INSTALL on iOS.
- Set OTHER_LDFLAGS based on platform-specific values.
* Configurations/SecItemShim.xcconfig:
- Set OTHER_LDFLAGS based on platform-specific values.
* Configurations/Version.xcconfig:
- Set SYSTEM_VERSION_PREFIX separately for iOS and OS X.
* Configurations/WebContentProcess.xcconfig:
- Only set EXCLUDED_SHIM_FILE_NAME on iOS.
- Only set CODE_SIGN_ENTITLEMENTS on iOS Simulator.
* Configurations/WebContentService.Development.xcconfig:
- Set INFOPLIST_FILE and BUNDLE_LOCALIZATION_KEY based on SDK.
- Only set CODE_SIGN_ENTITLEMENTS on iOS hardware.
- Set OTHER_LDFLAGS based on platform-specific values.
* Configurations/WebContentService.xcconfig: Ditto.
* Configurations/WebKit.xcconfig:
- Set FRAMEWORK_AND_LIBRARY_LDFLAGS, SECTORDER_FLAGS, and
  WK_API_AVAILABILITY_ENABLED based on SDK.
- Set OTHER_LDFLAGS based on platform-specific values.
- Only set EXCLUDED_SOURCE_FILE_NAMES on iOS.
* Configurations/WebKit2.xcconfig:
- Set INSTALL_PATH, INSTALL_PATH_ACTUAL, DYLIB_INSTALL_NAME_BASE,
  NORMAL_WEBKIT2_FRAMEWORKS_DIR, WEBKIT2_FRAMEWORKS_DIR and
  NORMAL_PRODUCTION_FRAMEWORKS_DIR based on SDK.
- Set SKIP_INSTALL on iOS.
* Configurations/WebProcessShim.xcconfig:
- Set OTHER_LDFLAGS based on platform-specific values.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@177621 268f45cc-cd09-0410-ab3c-d52691b4dbfc