Cast xgetbv from int64 to int to avoid Visual C warning.

TBR=kjellander@chromium.org
Bug: libyuv:735
Test: try bots
Change-Id: I00dc06689cd0a23847865c0c8edeb538b0cc81ac
Reviewed-on: https://chromium-review.googlesource.com/669142Reviewed-by: Frank Barchard <fbarchard@google.com>

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 1669
+Version: 1670
 License: BSD
 License File: LICENSE
 

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 1669
+#define LIBYUV_VERSION 1670
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_

source/cpu_id.cc

@@ -124,7 +124,7 @@ void CpuId(int eax, int ecx, int* cpu_info) {
 int GetXCR0() {
   int xcr0 = 0;
 #if defined(_MSC_FULL_VER) && (_MSC_FULL_VER >= 160040219)
-  xcr0 = _xgetbv(0);  // VS2010 SP1 required.
+  xcr0 = (int) _xgetbv(0);  // VS2010 SP1 required.  NOLINT
 #elif defined(__i386__) || defined(__x86_64__)
   asm(".byte 0x0f, 0x01, 0xd0" : "=a"(xcr0) : "c"(0) : "%edx");
 #endif  // defined(__i386__) || defined(__x86_64__)