Another Windows ARM64 fix (#253)

* Another Windows ARM64 fix

include stdint.h to be sure that uint64_t can be used.
This header already had references to uint32_t, so I assumed it was safe to use those typedefs, but a compile error revealed it was not always.

* fix munged whitespace

Author: jeremyd2019

src/aarch64_fpmath.h

@@ -27,6 +27,8 @@
  * $FreeBSD: head/lib/libc/aarch64/_fpmath.h 281197 2015-04-07 09:52:14Z andrew $
  */
 
+#include <stdint.h>
+
 union IEEEl2bits {
 	long double	e;
 	struct {