Unreviewed. Fix make distcheck.

Source/JavaScriptCore:

* GNUmakefile.list.am: Add missing headers files to compilation
and offlineasm/sh4.rb script.

Source/WebCore:

* GNUmakefile.am: Add missing scripts to EXTRA_DIST.
* GNUmakefile.list.am: Add missing files to compilation.

Source/WebKit2:

* GNUmakefile.list.am: Add missing header files to compilation.

Source/WTF:

* GNUmakefile.list.am: Add missing header file to compilation.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149277 268f45cc-cd09-0410-ab3c-d52691b4dbfc