rebuilt SDL2 for windows and macosx after applying some fixes from

mainstream.  some of the changes relevant to our supported targets
include:

- all:     - SDL2 hg r11769 (SDL bug #3996)

- mac:     - SDL2 hg r11709 (SDL bug #3951)
           - SDL2 hg r11710 (SDL bug #3976)
           - SDL2 hg r11786

- windows: - SDL2 hg r11716
           - SDL2 hg r11721 (SDL bug #3990)
           - SDL2 hg r11722 (SDL bug #3990)
           - SDL2 hg r11725
           - SDL2 hg r11758 (SDL bug #3931)
           - SDL2 hg r11761 (SDL bug #3931)
           - SDL2 hg r11803 (SDL bug #4019)
           - SDL2 hg r11815 (SDL bug #4018)
           - SDL2 hg r11824
           - SDL2 hg r11825 (SDL bug #4043)
           - SDL2 hg r11835 (SDL bug #3985)

git-svn-id: svn+ssh://svn.code.sf.net/p/quakespasm/code/trunk@1555 af15c1b1-3010-417e-b628-4374ebc0bcbd

quakespasm/MacOSX/SDL2.framework/Versions/A/Headers/SDL_platform.h

@@ -121,7 +121,12 @@
 #if defined(WIN32) || defined(_WIN32) || defined(__CYGWIN__) || defined(__MINGW32__)
 /* Try to find out if we're compiling for WinRT or non-WinRT */
 #if defined(_MSC_VER) && defined(__has_include)
-#define HAVE_WINAPIFAMILY_H __has_include(<winapifamily.h>)
+#if __has_include(<winapifamily.h>)
+#define HAVE_WINAPIFAMILY_H 1
+#else
+#define HAVE_WINAPIFAMILY_H 0
+#endif
+
 /* If _USING_V110_SDK71_ is defined it means we are using the Windows XP toolset. */
 #elif defined(_MSC_VER) && (_MSC_VER >= 1700 && !_USING_V110_SDK71_)    /* _MSC_VER == 1700 for Visual Studio 2012 */
 #define HAVE_WINAPIFAMILY_H 1

quakespasm/Windows/SDL2/include/SDL_platform.h

@@ -121,7 +121,12 @@
 #if defined(WIN32) || defined(_WIN32) || defined(__CYGWIN__) || defined(__MINGW32__)
 /* Try to find out if we're compiling for WinRT or non-WinRT */
 #if defined(_MSC_VER) && defined(__has_include)
-#define HAVE_WINAPIFAMILY_H __has_include(<winapifamily.h>)
+#if __has_include(<winapifamily.h>)
+#define HAVE_WINAPIFAMILY_H 1
+#else
+#define HAVE_WINAPIFAMILY_H 0
+#endif
+
 /* If _USING_V110_SDK71_ is defined it means we are using the Windows XP toolset. */
 #elif defined(_MSC_VER) && (_MSC_VER >= 1700 && !_USING_V110_SDK71_)    /* _MSC_VER == 1700 for Visual Studio 2012 */
 #define HAVE_WINAPIFAMILY_H 1