<rdar://problem/6581203> WebCore and WebKit should install the same set of headers during installhdrs phase as build phase

        Reviewed by Mark Rowe.

JavaScriptCore:

        * Configurations/Base.xcconfig: Defined REAL_PLATFORM_NAME based
        on PLATFORM_NAME to work around the missing definition on Tiger.
        Updated HAVE_DTRACE to use REAL_PLATFORM_NAME.

WebCore:

        The fix is to add INSTALLHDRS_COPY_PHASE = YES and
        INSTALLHDRS_SCRIPT_PHASE = YES to WebCore.xcconfig, then to make
        sure various build phase scripts work with the installhdrs build
        phase.

        * Configurations/Base.xcconfig: Defined REAL_PLATFORM_NAME
        based on PLATFORM_NAME to work around the missing definition on
        Tiger.
        * Configurations/WebCore.xcconfig: Added
        JAVASCRIPTCORE_PRIVATE_HEADERS_DIR variable to simplify logic in
        the "Generate Derived Sources" script.  Added
        INSTALLHDRS_COPY_PHASE = YES and INSTALLHDRS_SCRIPT_PHASE = YES.

        * WebCore.xcodeproj/project.pbxproj:
        - Added shell code to prevent running "Check For Global
          Initializers", "Check For Exit Time Destructors" and "Check
          For Weak VTables" scripts during the installhdrs build phase.
        - Made "Generate Derived Sources" work for the installhdrs build
          phase.  Also simplified setting of CREATE_HASH_TABLE by using
          JAVASCRIPTCORE_PRIVATE_HEADERS_DIR.

WebKit:

        The fix is to add INSTALLHDRS_COPY_PHASE = YES and
        INSTALLHDRS_SCRIPT_PHASE = YES to WebKit.xcconfig, then to
        make sure various build phase scripts work with the installhdrs
        build phase.

        * WebKit.xcodeproj/project.pbxproj:
        - Added shell code to prevent running "Check For Global
          Initializers", "Check For Exit Time Destructors" and "Check
          For Weak VTables" scripts during the installhdrs build phase.
        - Removed UMBRELLA_FRAMEWORKS_DIR from the Debug and Release
          targets since it's no longer needed after defining
          WEBCORE_PRIVATE_HEADERS_DIR in WebKit.xcconfig.

WebKit/mac:

        The fix is to add INSTALLHDRS_COPY_PHASE = YES and
        INSTALLHDRS_SCRIPT_PHASE = YES to WebKit.xcconfig, then to
        make sure various build phase scripts work with the installhdrs
        build phase.

        * Configurations/Base.xcconfig: Defined REAL_PLATFORM_NAME
        based on PLATFORM_NAME to work around the missing definition on
        Tiger.
        * Configurations/WebKit.xcconfig: Added
        WEBCORE_PRIVATE_HEADERS_DIR variable to remove definition of
        UMBRELLA_FRAMEWORKS_DIR for Debug and Release builds in the
        Xcode project file.  Added INSTALLHDRS_COPY_PHASE = YES and
        INSTALLHDRS_SCRIPT_PHASE = YES.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@41417 268f45cc-cd09-0410-ab3c-d52691b4dbfc