cogl: Ignore GL_CONTEXT_LOST when checking for GL errors
When using a context with robustness, glGetError() may return GL_CONTEXT_LOST at any time and this error doesn't get cleared until the application calls glGetGraphicsResetStatus() . This means that our error checking can't call glGetError() in a loop without checking for that return value and returning in that case. https://bugzilla.gnome.org/show_bug.cgi?id=739178
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0f2be43a
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