Update comment in FeatureDefines.xcconfig to reflect location of Visual Studio proper...

Update comment in FeatureDefines.xcconfig to reflect location of Visual Studio property files
for feature defines

Following r195498 and r201917 the Visual Studio property files for feature defines have
moved from directory WebKitLibraries/win/tools/vsprops to directory Source/cmake/tools/vsprops.
Update the comment in FeatureDefines.xcconfig to reflect the new location and names of these
files.

Source/JavaScriptCore:

* Configurations/FeatureDefines.xcconfig:

Source/WebCore:

* Configurations/FeatureDefines.xcconfig:

Source/WebCore/PAL:

* Configurations/FeatureDefines.xcconfig:

Source/WebKit:

* Configurations/FeatureDefines.xcconfig:

Source/WebKitLegacy/mac:

* Configurations/FeatureDefines.xcconfig:

Tools:

* TestWebKitAPI/Configurations/FeatureDefines.xcconfig:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@224841 268f45cc-cd09-0410-ab3c-d52691b4dbfc