[Feature] OpenGLES2 support

[DoktorCranium]

Raze version

No response

Which game are you running with Raze?

Blood

What Operating System are you using?

Other

If Other OS, please describe

Ubuntu 24.04 riscv64 DC-ROMA II Pad

Is your feature request related to a problem? Please describe.

Is OpenGLES2 supported in Raze ?
gzdoom when built with following cmake flags
cmake .. -DHAVE_GLES2=true -DHAVE_VULKAN=false
works fine on the riscv64 DC-ROMA II Pad (only OpenGLES2 acceleration supported on the GPU)

Raze seems to be missing the support,

Describe the solution you'd like

Enable GLES2

Describe alternatives you've considered

No response

Add any other context or screenshots about the feature request here.

No response