[GTK] YouCompleteMe doesn't work for cmake build system.
https://bugs.webkit.org/show_bug.cgi?id=131591

Reviewed by Martin Robinson.

Add cmake build system support for YouCompleteMe. It should work regardless of
using make or ninja. In addition, autotools related code is removed since it's
not used anymore in WebKit.

* Scripts/webkitdirs.pm:
(generateBuildSystemFromCMakeProject):
* gtk/ycm_extra_conf.py:
(transform_relative_paths_to_absolute_paths):
(FlagsForFile):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@167482 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Unreviewed, rolling out r167478.
https://bugs.webkit.org/show_bug.cgi?id=131840

Broke multicol tests (Requested by ap on #webkit).

Reverted changeset:

"[New Multicolumn] Pagination mode messed up with non-inline
axis and reversed direction."
https://bugs.webkit.org/show_bug.cgi?id=131811
http://trac.webkit.org/changeset/167478

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@167483 268f45cc-cd09-0410-ab3c-d52691b4dbfc