meson: Fix another reference to "gl" 9.2.0

Previous commit e6ef2b12 missed a spot.
3 jobs for meson-glvnd-compat in 5 minutes and 51 seconds
Status Job ID Name Coverage
  Docker Image
passed #721347
debian-testing

00:00:25

 
  Build And Test
passed #721348
autotools-build-and-test

00:05:25

passed #721349
meson-build-and-test

00:01:25