<http://webkit.org/b/54808> Change jsc target to build directly into JavaScriptCore.framework/Resources/jsc

Reviewed by Dan Bernstein.

* Configurations/Base.xcconfig: Added
JAVASCRIPTCORE_FRAMEWORKS_DIR variable.
* Configurations/JavaScriptCore.xcconfig: Used
JAVASCRIPTCORE_FRAMEWORKS_DIR to define INSTALL_PATH.
* JavaScriptCore.xcodeproj/project.pbxproj: Set the INSTALL_PATH
for Production configuration of jsc target.
(Copy Into Framework): Removed old build phase.
(Fix Framework Reference): Renamed build phase to "Copy Into
Framework".  Added "set -x" call to make the script print the
commands it is running.  Added code to exit early for Production
builds since this was never intended for them.  Added code to
copy jsc into the JavaScriptCore.framework/Resources directory.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@79131 268f45cc-cd09-0410-ab3c-d52691b4dbfc