Improvements to CMake configuration for the binary distribution (issue #1404).
- Linux: Fix unrecognized command line option "-Wno-literal-suffix" error.
- Linux: Fix "_FORTIFY_SOURCE" redefined error.
- Mac: Warn about undefined PROJECT_ARCH value.
- Provide default CMAKE_BUILD_TYPE value when unspecified in combination with Ninja or Unix Makefiles generator.

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk/cef3@1883 5089003a-bbd8-11dd-ad1f-f1f9622dbc98