contrib/ffmpeg: cleaned up compilation for iOS

contrib/src/ffmpeg/rules.mak

@@ -70,7 +70,10 @@ FFMPEGCONF += --cpu=core2
 endif
 endif
 ifdef HAVE_IOS
-FFMPEGCONF += --as="$(TOPSRC)/../extras/tools/gas/gas-preprocessor.pl $(CC)" --enable-pic
+FFMPEGCONF += --as="$(AS)" --enable-pic
+ifeq ($(ARCH), arm)
+FFMPEGCONF += --cpu=cortex-a8
+endif
 endif
 
 # Linux

contrib/src/main.mak

@@ -150,6 +150,11 @@ endif
 ifdef HAVE_IOS
 CC=xcrun clang
 CXX=xcrun clang++
+ifeq ($(ARCH), arm)
+AS=perl $(abspath ../../extras/tools/build/bin/gas-preprocessor.pl) $(CC)
+else
+AS=xcrun as
+endif
 AR=xcrun ar
 LD=xcrun ld
 STRIP=xcrun strip