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

convert some warnings to errors

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)

define _POSIX_C_SOURCE through CPPFLAGS

like dwm

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

fix dist target

include DWLCFLAGS into linking step

Merge pull request #251 from gwnichol/fixinstall

Fix make install while files are in use

Fix make install while files are in use

When the dwl executable is in use, cp fails without the -f flag.

POSIX defines this flag with:
> If a file descriptor for a destination file cannot be obtained,
> as described in step 3.a.ii., attempt to unlink the destination
> file and proceed.

add $(LIBS) to $(LDLIBS)

fix link failure with --as-needed

use LDFLAGS to build dwl target

do not generate *-protocol.{c,o}

according with
https://gitlab.freedesktop.org/wlroots/wlroots/-/commit/62fbf3f4ba1b2993e29dfb46f077e5806f7aac1c
they are unused and wlroots-based compositors don't need to do this

include xcb only when building with xwayland support

convert makefile to be more portable

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

chase wlroots X11 hints update

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

add dist target

add flag to print version and exit