Progress towards using CMake on Mac.

Progress towards using CMake on Mac.
https://bugs.webkit.org/show_bug.cgi?id=135662

Reviewed by Laszlo Gombos.

* CMakeLists.txt:
.:

Mavericks has a flex version of "flex 2.5.35 Apple(flex-31)" which CMake doesn't like on Mac.
* Source/cmake/WebKitFeatures.cmake:
* Source/cmakeconfig.h.cmake:
Added features that are needed by the Mac port.
* Source/cmake/OptionsMac.cmake:
Enable CSS_IMAGE_SET based on FeatureDefines.h.
Disable the FTL with CMake for now.
* Source/cmake/OptionsEFL.cmake:
* Source/cmake/OptionsGTK.cmake:
Enable subpixel layout to not conflict with FeatureDefines.h

Source/WebCore:

Added necessary include directories and idls.
* PlatformEfl.cmake:
* PlatformGTK.cmake:
Moved ImageSource.cpp and image-decoders to platform CMake files because they are not used on mac.
* PlatformMac.cmake:
Corrected some sources.
* config.h:
Added workaround for not using prefix headers with CMake.
* platform/graphics/ANGLEWebKitBridge.h:
Compile fix to find ANGLE headers while using CMake.
* platform/graphics/FormatConverter.h:
* platform/mac/NSScrollerImpDetails.h:
Removed unnecessary config.h includes.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@172346 268f45cc-cd09-0410-ab3c-d52691b4dbfc