Contrib: ffmpeg is not affected by the default optim flags

it uses its own system, so we must give it the proper value with --disable-option
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

contrib/src/ffmpeg/rules.mak

@@ -50,6 +50,7 @@ FFMPEGCONF += --disable-encoders --disable-muxers
 endif
 
 # Small size
+ifdef WITH_OPTIMIZATION
 ifdef ENABLE_SMALL
 FFMPEGCONF += --enable-small
 endif
@@ -58,6 +59,9 @@ ifdef HAVE_ARMV7A
 FFMPEGCONF += --enable-thumb
 endif
 endif
+else
+FFMPEGCONF += --optflags=-O0
+endif
 
 ifdef HAVE_CROSS_COMPILE
 FFMPEGCONF += --enable-cross-compile --disable-programs