build: Fix make dist when configured with --disable-wayland
I'd rather remove the conditional definition of SUBDIRS and put the conditions in the Makefiles instead. It's less confusing, since you're going through all the directories anyway when you make dist (and using DIST_SUBDIRS wouldn't help clarify things either).
Fixes: 0e3671b0
Closes: #507 (closed)
Related: !112 (merged)