25% faster floating point AAN IDCT.

Other float code likely benefits as well ...


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@12245 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

configure

@@ -1808,6 +1808,7 @@ elif enabled optimizations; then
         add_cflags "-O3"
     fi
 fi
+check_cflags -fno-math-errno
 
 # PIC flags for shared library objects where they are needed
 if enabled shared; then