Fix missing GL colorspace capability check using external EGL context
OpenGL applications don't get GL core profile when external EGL context is used.
Vendor: Mesa/X.org (0x1af4)
Device: virgl (Mesa Intel(R) Xe Graphics (TGL GT2)) (0x1010)
Version: 22.3.0
Accelerated: yes
Video memory: 0MB
Unified memory: no
Preferred profile: compat (0x2)
Max core profile version: 0.0
Max compat profile version: 2.1
We use external EGL for Venus support in Qemu. This MR fixes the missing GL capability check when external EGL is used. GL works properly with this fix applied.