Disable ENABLE_FULLSCREEN_API on iOS
https://bugs.webkit.org/show_bug.cgi?id=108250

Reviewed by Benjamin Poulain.

Source/JavaScriptCore:

* Configurations/FeatureDefines.xcconfig:

Source/WebCore:

* Configurations/FeatureDefines.xcconfig:

Source/WebKit/mac:

* Configurations/FeatureDefines.xcconfig:

Source/WebKit2:

* Configurations/FeatureDefines.xcconfig:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141477 268f45cc-cd09-0410-ab3c-d52691b4dbfc