fix(videoout): disable SDL DirectInput joystick enumeration on Windows

[oneandonlydean]

What

On Windows, SDL's DirectInput joystick enumeration blocks forever on machines with some vendor HID devices, so SDL_InitSubSystem(VIDEO | GAMECONTROLLER) in the VideoOutDriver constructor never returns and sceVideoOutOpen hangs. The constructor now sets SDL_HINT_DIRECTINPUT_ENABLED to 0 at SDL_HINT_DEFAULT priority before that call, so the SDL_DIRECTINPUT_ENABLED environment variable still overrides it. XInput and HIDAPI controllers are still detected; controllers reachable only through DirectInput are not, recorded in the libSceVideoOut technical debt.

Relands #1050 by @Tenith01 (their commit is kept as is, with the technical debt entry added as a second commit crediting them as co-author).

Fixes #1042

Tested

• Windows 11, RTX 4090, on the machine that reproduces Windows: SDL DirectInput enumeration in sceVideoOutOpen blocks forever on a HID device, so video out never opens #1042: the issue reporter confirmed that fix: disable DirectInput joystick enumeration on Windows #1050 with the default environment makes sceVideoOutOpen return and guest_video_out_wqhd_detection pass, while the unpatched build hangs (Windows: SDL DirectInput enumeration in sceVideoOutOpen blocks forever on a HID device, so video out never opens #1042 (comment)).
• Linux, Release, BUILD_TESTING=ON: builds; the change is compiled only on Windows. tools/check_conventions.py --base origin/main passes.
• Windows build: left to the full CI build.
• Not tested with a DirectInput-only controller connected.

Checklist

• Based on current main; no other open PR implements the same functions
• One topic per PR; follow-ups go in a new PR
• No comments in code except technical debt
• Unimplemented paths throw (NotImplemented_nid_no_patch); silent stubs are listed under Silent stubs in their library's technical debt file
• No notes, investigation .md files or images added to the repository (attach them to this PR)
• New third-party code is a submodule built from source
• Generic behaviour, not specific to one title
• Depends on: none
• Unblocks: none
• GPUs tested: NVIDIA GeForce RTX 4090, Windows 11 (issue reporter, driver not reported); the change only sets an SDL input hint before window creation and does not touch rendering
• AI-assisted: yes

Based on main feddf7f.

[github-actions]

Other open pull requests touch the same code. Merging one will break the other, or both implement the same thing. If this one builds on them, list them in Depends on.

Pull request	Conflicting files (lines on main)	Same exports	Same new files
#3664	core/libs/prx/libSceVideoOut/src/VideoOutDriver.cpp L261
#5239	docs/dev/debt/libSceVideoOut.md L25