Fix building kmsdrm without crtswitchres

[schellingb]

Description

I build for my Raspberry Pi (which runs Linux not Lakka) with KMSDRM (-DHAVE_KMS -DHAVE_DRM -DHAVE_PLAIN_DRM) but without crt-switchres (no -DHAVE_CRTSWITCHRES).

I think since #15131 the build fails like that but I haven't noticed it because I don't update the build on the Pi that often.

This PR adds an #ifdef HAVE_CRTSWITCHRES guard around the crtswitchres using code in drm_ctx.c and makes RetroArch work again in my environment.

Related Issues

Related Pull Requests

• [CRT] Add KMS modeswitch #15131

Reviewers

Maybe @substring who contributed the KMS modeswitching for CRT?

[substring]

wooopsie I'll be more careful in the future!

[schellingb]

@substring Hey no worries!!! The insane amount of environments RetroArch can run on this is impossible to avoid from time to time. Automated builds can only cover so many configurations. I think most of the time both things are enabled so it probably didn't cause much of an issue (it certainly didn't break Lakka or anything). On the contrary it being able to be fixed with a 1 line code change is a good thing I think :-) That is unless always returning false from gfx_ctx_drm_get_mode_from_video_state is not correct... I really have no idea about how this works, haha.