[build] Linking to Static SDL3

[wwderw]

I was trying the SDL backend on wayland and while I had built the static SDL library, raylib isn't linking to it, but is looking for the .so version.

I had tried in the makefile to change the include and lib paths to where I had it on my system, but that didn't work. Is there a way to link to a static version of SDL?

[raysan5]

@wwderw Maybe it was not considered on current Makefile yet, SDL3 was added quite recently.