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r8134 | ny00123 | 2019-10-19 00:28:17 -0700 (Sat, 19 Oct 2019) | 5 lines

startgtk.game.cpp edits:
1. Fix USE_OPENGL=0 builds.
2. Don't ignore the user's choice of BPP.
3. If eduke32.cfg has Polymer set to 1 and ScreenBPP set to 8 (e.g., the user changed from Polymer to Classic), don't tick Polymer and don't select an OpenGL mode.

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