tests/gl_basic_test: add apple/core context workaround
tests/gl_basic_test: add apple/core context workaround

Based on internet observations, Apple does not expose "(Core Profile)"
in the GL_VERSION string.

Add a "lovely" warning message + a workaround. Not 100% sure how useful
the former is, although it should not be too spammy.

Signed-off-by: Emil Velikov <f20878473f414da183da19ee25c8722cc1d711e4@collabora.com>

waffle-gl/waffle,waffle-gl/waffle,waffle-gl/waffle,waffle-gl/waffle