Rotate functions ported to C.  This completes all rotate functionality under c89, for overall 71% complete port.
BUG=303
TESTED=cl /c /TC /Iinclude source/rotate_argb.cc
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/6959004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@963 16f28f9a-4ce2-e073-06de-1de4eb20be90