ScreenRunner fails with "Could not create shader program" on the latest Raspbian Buster

Hi,
I'm having problems with OpenGL on R-Pi 3 here. AFAIU, the latest Raspbian does support SDL2.0.9:
```
apt show libsdl2-2.0-0
Package: libsdl2-2.0-0
Version: 2.0.9+dfsg1-1+rpt1
```
It seems to compile fine, however glCreateShader/glCreateProgram calls return 0 and glGetError returns 0 as well.
I'm using the full kms GL driver with 256MB memory split.
Could you, please, help me?