Merge topic 'remove-TARGET_DEFINED-genex'

cbf0756 Revert "Add the TARGET_DEFINED generator expression"
21a342c Remove use of TARGET_DEFINED from the target_link_libraries test.
47b8d32 Remove use of TARGET_DEFINED from the ExportImport test.
2e39d21 Remove use of TARGET_DEFINED from target_include_directories test.
Merge topic 'Win-HOST_SYSTEM_PROCESSOR'

add8d22 properly detect processor architecture on Windows
Merge topic 'xcode-COMBINE_HIDPI_IMAGES'

10d7bf4 Xcode: Generate recommended artwork setting (#13954)
Merge topic 'non-fatal-Qt4-missing-targets'

4d5230d Only add existing targets to the Qt4 target depends properties.
Merge topic 'ctest_update-Git-HEAD'

78b81b7 CTest: Fix ctest_update with 'HEAD' file in source tree
Merge topic 'fix-genex-split-duplication'

f93a388 Fix the cmGeneratorExpression::Split when leading chars are present.
Merge topic 'fix-genex-RPATH-handling'

dcb5907 Fix RPATH information when only a genex is used as a link library.
Merge topic 'GetPrerequisites-objdump'

12fb50d GetPrerequisites: Add documentation for objdump
8eb2fe9 GetPrerequisites: Enable test for BundleUtilities on MinGW
33c94c8 GetPrerequisites: Add support for objdump
5260a86 GetPrerequisites: Move tool search paths up
Merge branch 'master' into next