- fix http://bugs.webkit.org/show_bug.cgi?id=14666
          remove unused xxx-encodings.txt for all platforms other than Mac

        * platform/gdk/gdk-encodings.txt: Removed.
        * platform/win/win-encodings.txt: Removed.
        * platform/wx/wx-encodings.txt: Removed.

        * platform/character-sets.txt: Moved into mac subdirectory since it's only used for Mac; at some
        point I hope to remove it completely.
        * platform/make-charset-table.pl: Ditto.
        * platform/mac/character-sets.txt: Copied from platform/character-sets.txt.
        * platform/mac/make-charset-table.pl: Copied from platform/make-charset-table.pl.

        * DerivedSources.make: Moved CharsetData.cpp into the MACOS section.
        Changed the build rule to use Mac-specific paths for everything and got rid of
        make variables.

        * WebCore.vcproj/build-generated-files.sh: Removed code to set ENCODINGS_FILE and ENCODINGS_PREFIX.
        * WebCore.xcodeproj/project.pbxproj: Ditto.
        * make-generated-sources.sh: Ditto.

        * Projects/gdk/webcore-gdk.bkl: Removed code to pass gdk-encodings.txt to make-generated-sources.sh.
        * Projects/wx/webcore-wx.bkl: Ditto, but for wx-encodings.txt.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@24454 268f45cc-cd09-0410-ab3c-d52691b4dbfc