mesa: reimplement dispatch table no-op function handling

Use the new _glapi_new_nop_table() and _glapi_set_nop_handler() to
improve how we handle calling no-op GL functions.

If there's a current context for the calling thread, generate a
GL_INVALID_OPERATION error.  This will happen if the app calls an
unimplemented extension function or it calls an illegal function
between glBegin/glEnd.

If there's no current context, print an error to stdout if it's a debug
build.

The dispatch_sanity.cpp file has some previous checks removed since
the _mesa_generic_nop() function no longer exists.

This fixes the piglit gl-1.0-dlist-begin-end and gl-1.0-beginend-coverage
tests on Windows.

Reviewed-by: Jose Fonseca <[email protected]>

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