SFEmplayer-snap.spec: use fixed (constant) tarball by default,
restore cpu detection patch, make gui optional, format man page
--- libavcodec/x86/mlpdsp.c Thu Jun 4 01:48:28 2009
+++ ffmpeg/libavcodec/x86/mlpdsp.c Sat Jul 11 15:55:19 2009
@@ -107,1 +107,1 @@
-#define IOFFS AV_STRINGIFY(4*(MAX_FIR_ORDER + MAX_BLOCKSIZE))
+#define IOFFS AV_STRINGIFY(4* 168)