[Qt] WTR and InjectedBundle should not link statically against JSC/WTF https://bugs.webkit.org/show_bug.cgi?id=72697

Reviewed by Kenneth Rohde Christiansen.

.:

* Source/api.pri: On Linux, use a GNU LD version script to manage the
symbol exports, which includes the public WK1/WK2 API as well as a bunch
of private WTF symbols needed for WTR and the Injected Bundle.
* Source/qtwebkit-export.map: Added.

Tools:

* Tools.pro: Make WTR linux only for the moment.
* WebKitTestRunner/InjectedBundle/Target.pri: Remove static jsc/wtf linkage.
* WebKitTestRunner/Target.pri: Ditto.
* qmake/mkspecs/features/default_post.prf: Don't build the main webkit sources
with ELF visibility on Linux. Instead we're temporarily using an LD version script.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@100746 268f45cc-cd09-0410-ab3c-d52691b4dbfc