ios.config: Explicitly define STRIP
ios.config: Explicitly define STRIP

Fixes an ffmpeg build failure:

/bin/sh: arm-apple-darwin10-strip: command not found

atsushieno/cerbero,GStreamer/cerbero,GStreamer/cerbero,nirbheek/cerbero,fluendo/cerbero,fluendo/cerbero,fluendo/cerbero,atsushieno/cerbero,GStreamer/cerbero,atsushieno/cerbero,fluendo/cerbero,nirbheek/cerbero,fluendo/cerbero,atsushieno/cerbero,GStreamer/cerbero,nirbheek/cerbero,atsushieno/cerbero,GStreamer/cerbero,nirbheek/cerbero