FFmpeg 2.1.1 and iOS SDK 7.0, building on Mavericks

Build with FFmpeg 2.1.1 and iOS SDK 7.0 on Mavericks.

Also handle a stupid "make clean" but related to a stray file being created with the filename "-.d". It would probably be better to submit a patch to either ffmpeg or automake, but ... using the "--" argument to rm is pretty full-proof.