[CMAKE] Add GENERATE_BINDINGS macro to share the codes which use generate-bindings.pl.

[CMAKE] Add GENERATE_BINDINGS macro to share the codes which use generate-bindings.pl.
https://bugs.webkit.org/show_bug.cgi?id=90258

Reviewed by Rob Buis.

.:

This new macro calls generate-bindings.pl and append generated sources
into proper source list.

* Source/cmake/WebKitMacros.cmake:

Source/WebCore:

Use GENERATE_BINDINGS instead of using generate-bindings.pl directly.

* UseJSC.cmake:
* UseV8.cmake:
* PlatformBlackBerry.cmake:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121857 268f45cc-cd09-0410-ab3c-d52691b4dbfc