[EFL] Enable MHTML feature

[EFL] Enable MHTML feature
https://bugs.webkit.org/show_bug.cgi?id=105815

Patch by KwangYong Choi <ky0.choi@samsung.com> on 2013-01-01
Reviewed by Laszlo Gombos.

.:

ENABLE_MHTML is now ON for EFL.

* Source/cmake/OptionsEfl.cmake:

Source/WebCore:

Add application/x-mimearchive type to archive mime types.
Add mht and mhtml to extension map.

No new tests. Existing layout tests pass.

* loader/archive/ArchiveFactory.cpp:
(WebCore::archiveMIMETypes):
* platform/efl/MIMETypeRegistryEfl.cpp:
(WebCore):

Source/WebKit2:

Add missing include directory for ENABLE_MHTML.

* CMakeLists.txt:

Tools:

Enable MHTML feature for EFL port by default.

* Scripts/webkitperl/FeatureList.pm:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@138605 268f45cc-cd09-0410-ab3c-d52691b4dbfc