[Qt] REGRESSION(r137436): It made all inspector tests timeout on developer builds
https://bugs.webkit.org/show_bug.cgi?id=106554

Reviewed by Simon Hausmann.

.:

Explicitely link WebCore resources in the final DLL only on Windows to
support force_static_libs_as_shared on other platforms.

WebKit1 applications don't get the QtWebKit dynamic library loaded
since libQtWebKitWidgets doesn't depend on libQtWebKit if WebCore and
WebKit1 are dynamic libraries of their own.

* Source/api.pri:

Source/WebCore:

* Target.pri:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141892 268f45cc-cd09-0410-ab3c-d52691b4dbfc