[CMake] Add support for MAX_CPU_LOAD translated to -l in ninja and make
https://bugs.webkit.org/show_bug.cgi?id=130504

Reviewed by Martin Robinson.

* Scripts/build-webkit: Add the maxCPULoad() to the makeArgs in
CMake if not specified.
* Scripts/webkitdirs.pm:
(determineMaxCPULoad): Read MAX_CPU_LOAD as maxCPULoad.
(maxCPULoad): determineMaxCPULoad and return maxCPULoad.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@166058 268f45cc-cd09-0410-ab3c-d52691b4dbfc