[jhbuild] Correctly specify an alternate number of make jobs.
https://bugs.webkit.org/show_bug.cgi?id=113396 Reviewed by Philippe Normand. So far, we were using the `MAKEFLAGS' environment variable to pass the number of compilation jobs we wanted to jhbuild. jhbuild itself, on the other hand, prefers to use the `jobs' variable from jhbuildrc for that. We now behave more closely to the rest of the WebKit tools by first checking the `NUMBER_OF_PROCESSORS' environment variable and, if it is not set, just letting jhbuild itself figure out how many jobs to use. * efl/jhbuildrc: * gtk/jhbuildrc: git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146979 268f45cc-cd09-0410-ab3c-d52691b4dbfc