meson: add ctags and etags targets
meson: add ctags and etags targets

to create tag files. Idea taken from systemd.

Signed-off-by: Guido Günther <7ebf60a2ee90c1ac7f28776faba2e1a6e374ba74@sigxcpu.org>

swaywm/wlroots,SirCmpwn/wlroots,ascent12/wlroots,ascent12/wlroots,swaywm/wlroots