build/make/configure.sh: Embed bitcode in arm darwin targets.
build/make/configure.sh: Embed bitcode in arm darwin targets.

When the iOS SDK major version is 9 or higher:
- Pass -fembed-bitcode to compiler, assembler, and linker.
- Add a warning for simulator targets since yasm doesn't know
  what -fembed-bitcode means, and exits with an error.

BUG=https://code.google.com/p/webm/issues/detail?id=1075

Change-Id: I38c997a0225e53c5dd1b4ddf7935d21362953f76

jmvalin/aom,mwgoldsmith/libvpx,ittiamvpx/libvpx-1,mwgoldsmith/libvpx,ShiftMediaProject/libvpx,openpeer/libvpx_new,mbebenita/aom,mwgoldsmith/vpx,webmproject/libvpx,jmvalin/aom,shacklettbp/aom,jmvalin/aom,luctrudeau/aom,luctrudeau/aom,ittiamvpx/libvpx-1,smarter/aom,mwgoldsmith/vpx,mwgoldsmith/libvpx,mbebenita/aom,mwgoldsmith/vpx,Topopiccione/libvpx,ShiftMediaProject/libvpx,shacklettbp/aom,shacklettbp/aom,GrokImageCompression/aom,ShiftMediaProject/libvpx,mwgoldsmith/libvpx,smarter/aom,luctrudeau/aom,webmproject/libvpx,ittiamvpx/libvpx-1,ittiamvpx/libvpx-1,GrokImageCompression/aom,thdav/aom,mwgoldsmith/vpx,ShiftMediaProject/libvpx,mbebenita/aom,Topopiccione/libvpx,smarter/aom,shacklettbp/aom,GrokImageCompression/aom,thdav/aom,ittiamvpx/libvpx-1,mwgoldsmith/libvpx,thdav/aom,mbebenita/aom,GrokImageCompression/aom,Topopiccione/libvpx,shacklettbp/aom,Topopiccione/libvpx,ittiamvpx/libvpx-1,GrokImageCompression/aom,smarter/aom,smarter/aom,mwgoldsmith/vpx,jmvalin/aom,Topopiccione/libvpx,smarter/aom,Topopiccione/libvpx,openpeer/libvpx_new,openpeer/libvpx_new,mbebenita/aom,webmproject/libvpx,mbebenita/aom,shacklettbp/aom,luctrudeau/aom,mbebenita/aom,openpeer/libvpx_new,GrokImageCompression/aom,jmvalin/aom,openpeer/libvpx_new,jmvalin/aom,mwgoldsmith/vpx,luctrudeau/aom,mwgoldsmith/libvpx,thdav/aom,thdav/aom,openpeer/libvpx_new,webmproject/libvpx,luctrudeau/aom,mbebenita/aom,webmproject/libvpx,webmproject/libvpx,mbebenita/aom,thdav/aom,ShiftMediaProject/libvpx