evas: fix evas flushing its command queue to wrong gl context in gl-backends

For native surface rendering (glX, egl) in gl-backend,  if pixel get callback
function is called for native rendering, there is a case where evas will
try to call evas_gl_common_context_flush() to flush its remaining commands
in its command queue while the context is set current to the native surface/
context that is called within the pixel get callback.  So, I've added an
engine function that forces a flush before it enters the pixel get callback
function.

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