SDL: cmake: Fix MinGW build break in WGI joystick driver

SDL Commits
1 
From 7e8469d1961f7c51176fca6f1a4d1c89ad7bf035 Mon Sep 17 00:00:00 2001
From: Cameron Gutman <[EMAIL REDACTED]>
Date: Sun, 31 Oct 2021 09:31:25 -0500
Subject: [PATCH] cmake: Fix MinGW build break in WGI joystick driver

Just look for windows.gaming.input.h rather than assuming its presence
or absence based on other CMake variables.

Fixes MinGW builds in CI
---
 CMakeLists.txt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 294e93c968..3f5b6c0ab0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1534,6 +1534,7 @@ elseif(WINDOWS)
       #include <xinput.h>
       XINPUT_STATE_EX s1;
       int main(int argc, char **argv) { }" HAVE_XINPUT_STATE_EX)
+    check_include_file(windows.gaming.input.h HAVE_WINDOWS_GAMING_INPUT_H)
   endif()
 
   # headers needed elsewhere
@@ -1712,8 +1713,7 @@ elseif(WINDOWS)
     endif()
     if(HAVE_XINPUT_H)
       set(SDL_JOYSTICK_XINPUT 1)
-      if(NOT CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION STREQUAL "")
-        # Has Windows 10 SDK, so has Windows.Gaming.Input
+      if(HAVE_WINDOWS_GAMING_INPUT_H)
         set(SDL_JOYSTICK_WGI 1)
       endif()
     endif()