This repairs pixel/vertex shader code that was seemingly
experimented with during testing, but it was never used and no
shaders ever made it to the data files.
- BBGE_BUILD_SHADERS defined
- Blur enabled in config
- Entering a "warplocalnode"-Node while taking damage
These conditions caused it to enable shader related code while taking the
screenshot for the warp transition, that caused a crash because the shader-
related gl*() function pointers were not initialzed, because the current
code never loads any shaders.