https://bugs.webkit.org/show_bug.cgi?id=127073

Reviewed by Daniel Bates.

* Scripts/build-webkit: Unify all the ports that call buildCMakeProjectOrExit with
the new isCMakeBuild conditional. This allows us to share more code between ports.
Pass the build arguments to the removeCMakeCache function.
* Scripts/webkitdirs.pm:
(runAutogenForAutotoolsProjectIfNecessary): Renamed mustReRunAutogen to cachedArgumentFileOutOfDate
because it's now shared with the CMake build.
(cachedArgumentFileOutOfDate): Renamed.
(cmakeCachePath): Added this helper which gets the CMakeCache.txt path.
(shouldRemoveCMakeCache): Tries to preserve current behavior for all ports,
except GTK+ which examines the OptionsGTK.cmake and OptionsCommon.cmake file
as well as checking if build-webkit has been run with different arguments.
(removeCMakeCache): Call shouldRemoveCMakeCache now.
(generateBuildSystemFromCMakeProject): Exit early if CMakeCache.txt exists for GTK+.
(isCMakeBuild): Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@162545 268f45cc-cd09-0410-ab3c-d52691b4dbfc