For out-of-source builds, get rid of this warning:
ls: cannot access ../../Documentation/snippets/*.ly: No such file
scripts/auxiliar/tely-gettext.py scripts/auxiliar/translations-status.py
TELY_FILES = $(shell ls $(depth)/Documentation/*.tely)
TELY_FILES += $(foreach l, $(LANGS), $(shell ls $(depth)/Documentation/$(l)/*.tely))
-LSR_LYS := $(shell ls $(depth)/Documentation/snippets/*.ly)
+LSR_LYS = $(shell ls $(depth)/Documentation/snippets/*.ly)
TELY_FILES += $(LSR_LYS:%.ly=../%.ly)
messages: $(outdir)/messages