[Gridflow-dev] slight ./configure ugliness when sdl-config not found

[Claude Heiland-Allen]

Hey,

When SDL development files are not installed, ./configure looks like 
this (with the first two lines in green)

---8<---
sh: sdl-config: not found
sh: sdl-config: not found
[sdl] Simple Directmedia Layer (experimental support): sh: sdl-config: 
not found
sh: sdl-config: not found
------------------------> missing (where is SDL/SDL.h ?)
---8<---


Claude