https://bugs.webkit.org/show_bug.cgi?id=78364

Patch by ChangSeok Oh <shivamidow@gmail.com> on 2012-02-13
Reviewed by Gustavo Noronha Silva.

.:

Added some lines to show checking messages, whether mhtml is enabled or not
during configuration and the configuration result for mhtml.
MHTML is a web page archive format used to combine resources
that are typically represented by external links (such as images, Flash animations,
Java applets, audio files) together with HTML code into a single file.
http://en.wikipedia.org/wiki/MHTML

* configure.ac:

Source/WebCore:

Added mhtml directory and removed target files duplicated to build when enabling mhtml.
Archive.cpp, ArchiveFactory.cpp & their headers are included at the above line.
This duplication has caused build-break if mhtml is enabled.

No new tests, since no new features.

* GNUmakefile.am:
* GNUmakefile.list.am:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@107565 268f45cc-cd09-0410-ab3c-d52691b4dbfc