process_pipeline: Require OpenGL 3.2
Fixes the warning in terminal:
(megapixels:4943): Gdk-WARNING **: 20:35:40.710: gdk_gl_context_set_required_version - GL context versions less than 3.2 are not supported.
Fixes the warning in terminal:
(megapixels:4943): Gdk-WARNING **: 20:35:40.710: gdk_gl_context_set_required_version - GL context versions less than 3.2 are not supported.