Mac OS compile fix

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1139 c046a42c-6fe2-441c-8c8c-71466251a162

exec.c

@@ -21,6 +21,7 @@
 #ifdef _WIN32
 #include <windows.h>
 #else
+#include <sys/types.h>
 #include <sys/mman.h>
 #endif
 #include <stdlib.h>