patch for ffmpeg

--- configure   (revision 14338)
+++ configure   (working copy)
@@ -440,8 +440,8 @@
     name="$1"
     asm="$2"
     shift 2
-    check_cc "$@" <<EOF && enable $name || disable $name
-int foo(void){ asm volatile($asm); }
+    check_exec "$@" <<EOF && enable $name || disable $name
+void main(void){ asm volatile($asm); }
 EOF
 }