Add an actual 3dnow intrinsinc so the configure script doesn't just check for...

Add an actual 3dnow intrinsinc so the configure script doesn't just check for the existence of the 3dnow header


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@5383 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

configure

@@ -1110,6 +1110,7 @@ fi
 cat > $TMPC << EOF
 #include <mm3dnow.h>
 int main(void) {
+_m_femms();
 return 0;
 }
 EOF