https://bugs.webkit.org/show_bug.cgi?id=94435

Reviewed by Martin Robinson.

More people have been reporting problems when linking WebCore because
the command line limit is being exceeded. Splitting WebCore a bit more
is in order.

.:

* GNUmakefile.am: add variable that will hold the list of source files
for libWebCorePlatform .

Source/WebCore:

* GNUmakefile.am: add new libWebCorePlatform convenience library.
* GNUmakefile.list.am: move list of platform/* files to its own variable.

Source/WebKit/gtk:

* GNUmakefile.am: link libWebCorePlatform into libwebkitgtk

Source/WebKit2:

* GNUmakefile.am: link libWebCorePlatform into libwebkit2gtk

Tools:

* GNUmakefile.am: link libWebCorePlatform into DRT

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@126306 268f45cc-cd09-0410-ab3c-d52691b4dbfc