Start to support nvidia proprietary driver please

[safocl]

i have gtx 1650 and 495 proprietary driver that support for GBM now, but SWAY don't start.

please turn off this the bad code sample on

sway/sway/main.c

Line 52 in 38020d1

void detect_proprietary(int allow_unsupported_gpu) {

[rpigott]

You can use --unsupported-gpu to ignore the check.

[safocl]

You can use --unsupported-gpu to ignore the check.

i start under xorg server

--> sway --unsupported-gpu
00:00:00.003 [sway/main.c:97] !!! Proprietary Nvidia drivers are in use !!!
00:00:00.004 [wlr] [backend/x11/backend.c:608] Failed to query DRI3 DRM FD
00:00:00.004 [sway/server.c:53] Unable to create backend

[emersion]

Proprietary drivers are unsupported. Don't open issues if you're using them.

[safocl]

Proprietary drivers are unsupported. Don't open issues if you're using them.

this feature was before the nvidia driver supported GBM

[safocl]

i started sway with nvidia proprietary driver from sddm for "sway --unsupported-gpu" command line changed in sway.desktop file.
ok...