Use XINPUT_STATE instead of XINPUT_STATE_EX (thanks Andrew!)

XINPUT_STATE_EX isn't actually a thing, we can just use the normal XINPUT_STATE

Fixes https://github.com/libsdl-org/SDL/issues/2797

CMakeLists.txt

@@ -1824,16 +1824,6 @@ elseif(WINDOWS)
       #include <windows.h>
       #include <xinput.h>
       int main(int argc, char **argv) { return 0; }" HAVE_XINPUT_H)
-    check_c_source_compiles("
-      #include <windows.h>
-      #include <xinput.h>
-      XINPUT_GAMEPAD_EX x1;
-      int main(int argc, char **argv) { return 0; }" HAVE_XINPUT_GAMEPAD_EX)
-    check_c_source_compiles("
-      #include <windows.h>
-      #include <xinput.h>
-      XINPUT_STATE_EX s1;
-      int main(int argc, char **argv) { return 0; }" HAVE_XINPUT_STATE_EX)
     check_c_source_compiles("
       #define COBJMACROS
       #include <windows.gaming.input.h>