[GTK] Set up the TestJavaScriptCore in TestWebKitAPI
https://bugs.webkit.org/show_bug.cgi?id=115236

Reviewed by Gustavo Noronha Silva.

Set up the TestJavaScriptCore unit test program, consisting of the unit tests
under the TestWebKitAPI/Tests/JavaScriptCore directory.

* TestWebKitAPI/GNUmakefile.am:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149296 268f45cc-cd09-0410-ab3c-d52691b4dbfc