btrfs-progs: build: generate all dependency files

We're missing several dependency files like:

$ diff -u <(find -name '*.o'|cut -d. -f2|sort) <(find -name '*.o.d'|cut -d. -f2|sort)
@@ -3,7 +3,6 @@
 /btrfs-corrupt-block
 /btrfs-debug-tree
 /btrfs-find-root
-/btrfs-list
 /btrfs-map-logical
 /btrfs-select-super
 /btrfstune
@@ -29,11 +28,6 @@
 /cmds-scrub
 /cmds-send
 /cmds-subvolume
-/convert/common
-/convert/main
-/convert/source-ext2
-/convert/source-fs
-/convert/source-reiserfs
 /ctree
 /dir-item
 /disk-io
<snip>

This is due to moving things out of objects and cmds_objects variables. Such
missing dependency files cause mis-building of some source files (try touch
utils.h; make mkfs/main.o).

This patch introduce a new variable "all_objects" to keep all the objects and
use the variable to generate proper dependency file building rules.

Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>

Makefile

@@ -121,6 +121,9 @@ libbtrfs_headers = send-stream.h send-utils.h send.h kernel-lib/rbtree.h btrfs-l
 convert_objects = convert/main.o convert/common.o convert/source-fs.o \
 		  convert/source-ext2.o convert/source-reiserfs.o
 mkfs_objects = mkfs/main.o mkfs/common.o
+image_objects = image/main.o
+all_objects = $(objects) $(cmds_objects) $(libbtrfs_objects) $(convert_objects) \
+	      $(mkfs_objects) $(image_objects)
 
 TESTS = fsck-tests.sh convert-tests.sh
 
@@ -592,5 +595,5 @@ uninstall:
 	cd $(DESTDIR)$(bindir); $(RM) -f -- btrfsck fsck.btrfs $(progs_install)
 
 ifneq ($(MAKECMDGOALS),clean)
--include $(objects:.o=.o.d) $(cmds_objects:.o=.o.d) $(subst .btrfs,, $(filter-out btrfsck.o.d, $(progs:=.o.d)))
+-include $(all_objects:.o=.o.d) $(subst .btrfs,, $(filter-out btrfsck.o.d, $(progs:=.o.d)))
 endif