[CMake] Use COMPILE_DEFINITIONS target property for setting BUILDING_* defines

[CMake] Use COMPILE_DEFINITIONS target property for setting BUILDING_* defines
https://bugs.webkit.org/show_bug.cgi?id=121672

Reviewed by Gyuyoung Kim.

Since the scope of add_definitions() is always a whole file, we need to use
target properties instead to set definitions only for specific targets.

Source/JavaScriptCore:

* CMakeLists.txt:

Source/WebCore:

* CMakeLists.txt:

Source/WebKit:

* CMakeLists.txt:

Source/WTF:

* wtf/CMakeLists.txt:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@156159 268f45cc-cd09-0410-ab3c-d52691b4dbfc