replace spaces with tabs

Fixes: 71f11e6cf63289d51f152469a0da81a85fe2608c

set O_NONBLOCK flag to stdout

Merge remote-tracking branch 'upstream/main' into wlroots-next

sort util.c functions

Merge remote-tracking branch 'djpohly/main' into HEAD

new functions ecalloc() and die()

die() replaces EBARF and BARF
and allow us to add `-pedantic` to CFLAGS