New comment by amak79 on void-packages repository

https://github.com/void-linux/void-packages/issues/32246#issuecomment-890437664

Comment:
@TegarOk can you please re-open this issue.

I think I've made some sense of the many of RetroArch OpenGL/ES configure options.
```
  --enable-opengl             Enable   OpenGL 2.0 support
  --disable-opengl            Disable  OpenGL 2.0 support
  --disable-opengl_core       Disable  Modern OpenGL driver support (GLES3+/GL3.2 core+), requires OpenGL.
  --disable-opengl1           Disable  OpenGL 1.1 support
  --enable-opengles           Enable   Use GLESv2 instead of desktop GL
  --enable-opengles3          Enable   OpenGLES3 support
  --enable-opengles3_1        Enable   OpenGLES3.1 support
  --enable-opengles3_2        Enable   OpenGLES3.2 support
```
The `--enable-opengl_core` option will enable both OpenGL (3.2+) and OpenGL ES (3+) support. I mistakenly thought that `--enable-opengles` was needed for OpenGL ES support. I still don't know when this option should be used.

I've tested RetroArch with `opengl` enabled and `gles2` disabled on an RPi 3B+. RetroArch reports that OpenGL ES support is disabled and so far everything works.

I think I need to re-work the template to either disable `gles2` by default or drop it entirely.

@ericonr can you please add your thoughts on this issue.