Change QOpenGLTextureBlitter to be a public API, as it was originally intended.
There are now significant external uses outside qtbase (C++ compositor examples
in QtWayland), and the API is considered proven enough.
[ChangeLog][QtGui] QOpenGLTextureBlitter, a utility class to draw textured quads,
has been made public.
Change-Id: If7a2c94e1494195e2aa375d214932fa7b4c78321
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>
dd3a08dd53
