Merge branch 'wlroots-next' into main

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

rework Makefile

- allow user to use a different pkg-config binary
- restore almost all (and add other ones) warning flags (-Werror is not set)
- $(XWAYLAND) is added to our CPPFLAGS
- remove useless comments
- don't generate idle-protocol.h (not used)

add missing library (xcb-icccm)

this library is also used by wlroots, so nothing new

append `-dev` to $(_VERSION) (should have added it a long time ago)

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

use `git describe` to generate version

include xcb only when building with xwayland support

convert makefile to be more portable

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

add flag to print version and exit

don't let -pedantic be overridable by environment

new functions ecalloc() and die()

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

add dwl(1)

Documentation is good.  Man pages are documentation.  A program without
a man page is worthless.

Merge pull request #180 from Humm42/manpage

add dwl(1)

Merge branch 'main' into wlroots-next

Merge branch 'main' into scenegraph

add dwl(1)

Documentation is good.  Man pages are documentation.  A program without
a man page is worthless.

don't warn about unused result

Closes: #186

XWayland still buggy, disable by default