Removed check for _HAVE_STDINT_H, which nobody defines

Fixes https://github.com/libsdl-org/SDL/issues/6619

(cherry picked from commit e29c0661cc29550aa3e1c8489124c9a52dd546a3)

include/SDL_config.h.cmake

@@ -539,7 +539,7 @@
 #cmakedefine SDL_VIDEO_VITA_PVR @SDL_VIDEO_VITA_PVR@
 #cmakedefine SDL_VIDEO_VITA_PVR_OGL @SDL_VIDEO_VITA_PVR_OGL@
 
-#if !defined(_STDINT_H_) && (!defined(HAVE_STDINT_H) || !_HAVE_STDINT_H)
+#if !defined(HAVE_STDINT_H) && !defined(_STDINT_H_)
 /* Most everything except Visual Studio 2008 and earlier has stdint.h now */
 #if defined(_MSC_VER) && (_MSC_VER < 1600)
 typedef signed __int8 int8_t;

include/SDL_config_minimal.h

@@ -34,7 +34,7 @@
 #define HAVE_STDARG_H   1
 #define HAVE_STDDEF_H   1
 
-#if !defined(_STDINT_H_) && (!defined(HAVE_STDINT_H) || !_HAVE_STDINT_H)
+#if !defined(HAVE_STDINT_H) && !defined(_STDINT_H_)
 /* Most everything except Visual Studio 2008 and earlier has stdint.h now */
 #if defined(_MSC_VER) && (_MSC_VER < 1600)
 typedef signed __int8 int8_t;

include/SDL_config_windows.h

@@ -52,7 +52,7 @@
 
 /* This is a set of defines to configure the SDL features */
 
-#if !defined(_STDINT_H_) && (!defined(HAVE_STDINT_H) || !_HAVE_STDINT_H)
+#if !defined(HAVE_STDINT_H) && !defined(_STDINT_H_)
 /* Most everything except Visual Studio 2008 and earlier has stdint.h now */
 #if defined(_MSC_VER) && (_MSC_VER < 1600)
 typedef signed __int8 int8_t;