Fixing include issues for WinRT builds.

include/bx/os.h

@@ -10,6 +10,7 @@
 
 #if BX_PLATFORM_WINDOWS || BX_PLATFORM_WINRT
 #	include <windows.h>
+#   include "debug.h"
 #elif BX_PLATFORM_ANDROID \
 	|| BX_PLATFORM_EMSCRIPTEN \
 	|| BX_PLATFORM_FREEBSD \

include/bx/platform.h

@@ -107,6 +107,7 @@
 #	define BX_PLATFORM_XBOX360 1
 #elif defined(_WIN32) || defined(_WIN64)
 // http://msdn.microsoft.com/en-us/library/6sehtctf.aspx
+#   include <windows.h>
 #	if !defined(WINAPI_FAMILY) || (WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP)
 #		undef  BX_PLATFORM_WINDOWS
 #		if !defined(WINVER) && !defined(_WIN32_WINNT)