Removed some uses of sys/types.h

It's useful to be able to compile openlibm in environments where this
doesn't exist (e.g. OS kernels).

include/types-compat.h

@@ -1,7 +1,7 @@
 #ifndef _TYPES_COMPAT_H_
 #define	_TYPES_COMPAT_H_
 
-#include <sys/types.h>
+#include <stdint.h>
 #include <limits.h>
 #include <stdint.h>
 

src/s_modfl.c

@@ -39,7 +39,6 @@
 #include <float.h>
 #include <openlibm.h>
 #include "math_private.h"
-#include <sys/types.h>
 
 #include "fpmath.h"