Don't call xf86DisableRandR in ABI_VIDEODRV_VERSION 24 & later
The API was removed by Xserver commit dd00e5466a0e4ea313d1860824da4123692827ed in xorg-server-1.20.0 and later.
Found by gcc -Werror=implicit:
riva_driver.c: In function ‘RivaScreenInit’:
riva_driver.c:1213:12: error: implicit declaration of function ‘xf86DisableRandR’; did you mean ‘xf86DisableIO’? [-Werror=implicit-function-declaration]
1213 | xf86DisableRandR();
| ^~~~~~~~~~~~~~~~
| xf86DisableIO
nv_driver.c: In function ‘NVScreenInit’:
nv_driver.c:2635:16: error: implicit declaration of function ‘xf86DisableRandR’; did you mean ‘xf86DisableIO’? [-Werror=implicit-function-declaration]
2635 | xf86DisableRandR();
| ^~~~~~~~~~~~~~~~
| xf86DisableIO