Jelle Raaijmakers b79642ef74 LibGL: Support missing context in glGetError and glGetIntegerv ...

In its current state, ScummVM seems to invoke these methods just after
destroying the current GL context. According to the OpenGL spec:

    "Issuing GL commands when the program does not have a current
     context results in undefined behavior, up to and including program
     termination."

Our old behavior was to deref a `nullptr`, which isn't that great. For
now, protect these two methods. If other ports seem to misbehave as
well, we can always expand the check to other methods.

2021-12-12 21:51:08 +01:00

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