Move UseJSC.cmake back to CMakeLists.txt
https://bugs.webkit.org/show_bug.cgi?id=130834

Patch by Eva Balazsfalvi <evab.u-szeged@partner.samsung.com> on 2014-04-10
Reviewed by Csaba Osztrogonác.

No new tests required.

* CMakeLists.txt:
* UseJSC.cmake: Removed.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@167071 268f45cc-cd09-0410-ab3c-d52691b4dbfc