The sdl pkg-config is named wrong

[SolarAquarion]

It's named sdl.pc instead of sdl2.pc or does it want sdl1.2?

[ell1e]

I just ran into the same problem. By now there's SDL3, so a lot of systems won't have SDL1 & SDL2 necessarily installed anymore. Some clarification on whether it's really meant to link sdl1.2 or whether it should possibly be renamed would be helpful. I verified that quirc builds fine when replacing this with sdl2 or sdl3, which seems to suggest this should be renamed.

[olejorgenb]

The quirc-demo program does not compile with SDL2

Also, ref: #85