Change to better test for dinput.h/HAVE_DINPUT_H

[stahta01]

• I confirm that I am the author of this code and release it to the SDL project under the Zlib license. This contribution does not contain code from other sources, including code generated by a Large Language Model ("AI").

Changed the test for "dinput.h" to a test based on the "xinput.h" test.

Description

The simple test of "dinput.h" failed to work on Cygwin. This change fixes Cygwin and did not break Msys UCRT64 during my testing. And I verified that "windows.h" was needed under Cygwin.

I reversed the location change in response to a comment; That said "dinput (DirectInput) is part of DirectX".

Existing Issue(s)

[sezero]

Checks for the four others above probably need the same massage

[stahta01]

Checks for the four others above probably need the same massage

I saw five places. Do you wish me to add another commit with the five places?

[stahta01]

Checks for the four others above probably need the same massage

I saw five places. Do you wish me to add another commit with the five places?

I double checked and one was a mistake; unless check_cxx_source_compiles counts.

I pushed the four places and that commit can just be ignored or I can remove it if it is not wanted.

[sezero]

I meant the checks for d3d9.h, d3d11_1.h, ddraw.h and dsound.h above the dinput.h check.

[stahta01]

I meant the checks for d3d9.h, d3d11_1.h, ddraw.h and dsound.h above the dinput.h check.

Okay, I forced pushed to remove the commit that was wrong. I have verified those four files exist on my PC. I will work on adding the tests for them. It will take some time my PC takes 15 minutes a build cycle.
The four of them worked after the change under Cygwin.