Makefile: tuck away generated makefile fragments in .depend

When building with COMPUTE_HEADER_DEPENDENCIES on, save
dependency information to .depend/ instead of deps/ so it does
not show up in ‘ls’ output.  Otherwise, the extra directories can
be distracting.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Makefile

@@ -1692,15 +1692,15 @@ XDIFF_OBJS = xdiff/xdiffi.o xdiff/xprepare.o xdiff/xutils.o xdiff/xemit.o \
 	xdiff/xmerge.o xdiff/xpatience.o
 OBJECTS := $(GIT_OBJS) $(XDIFF_OBJS)
 
-dep_files := $(foreach f,$(OBJECTS),$(dir $f)deps/$(notdir $f).d)
+dep_files := $(foreach f,$(OBJECTS),$(dir $f).depend/$(notdir $f).d)
 
 ifdef COMPUTE_HEADER_DEPENDENCIES
-dep_dirs := $(addsuffix deps,$(sort $(dir $(OBJECTS))))
+dep_dirs := $(addsuffix .depend,$(sort $(dir $(OBJECTS))))
 $(dep_dirs):
 	mkdir -p $@
 
 missing_dep_dirs := $(filter-out $(wildcard $(dep_dirs)),$(dep_dirs))
-dep_file = $(dir $@)deps/$(notdir $@).d
+dep_file = $(dir $@).depend/$(notdir $@).d
 dep_args = -MF $(dep_file) -MMD -MP
 ifdef CHECK_HEADER_DEPENDENCIES
 $(error cannot compute header dependencies outside a normal build. \