Check for mkdir -p or equivalent, and use that rather than simple mkdir to create...

Check for mkdir -p or equivalent, and use that rather than simple mkdir to create the modules, modules/gconf and modules/rtp directories.

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@2077 fefdeb5f-60dc-0310-8127-8f9354f1896f