exit on display error

When the compositor exits, wawa ends up in an infinite loop because it doesn't properly check if wl_display_dispatch encountered an error, making it very heavy on the cpu.

Reviewed-on: https://codeberg.org/sewn/wawa/pulls/8

mk: use -D_GNU_SOURCE

Reviewed-on: https://codeberg.org/sewn/wawa/pulls/3

remove mman.h include

Remove dublicate mman.h include.

Reviewed-on: https://codeberg.org/sewn/wawa/pulls/4

fix memfd linux usage

Reviewed-on: https://codeberg.org/sewn/wawa/pulls/2

README: oops

support spreading across monitors

handle output xy

make the fit/fill make sense

README: make some claims

color parse fail to usage

remove unnecessary loc

free image upon configure

implement color, fit, fill, tile, stretch

fix some goofs

drop usage of wp_viewporter

import stb_image_resize2

reduce memory usage

mk: posix compliance

The Open Group Base Specifications Issue 8 IEEE Std 1003.1-2024 does not specify link rules for linking executables with LDLIBS, see: 

https://pubs.opengroup.org/onlinepubs/9799919799/

mk: misc. fixes

initial commit