[Qt] Replace GNU linker script for exports with export macros in WTF/JSC

[Qt] Replace GNU linker script for exports with export macros in WTF/JSC
https://bugs.webkit.org/show_bug.cgi?id=77723

Patch by Simon Hausmann <simon.hausmann@nokia.com> on 2012-02-03
Reviewed by Tor Arne Vestbø.

.:

* Source/api.pri: Remove use of GNU linker script on Linux.
* Source/qtwebkit-export.map: Removed.

Source/JavaScriptCore:

* wtf/Platform.h: Enable use of export macros.

Tools:

* Tools.pro: Compile WTR again on all platforms with WK2.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@106650 268f45cc-cd09-0410-ab3c-d52691b4dbfc