Makefile: Fix some dependencies

Some deps are already referenced by depends.mk, some where actually
missing.

Signed-off-by: Kai Krakow <kai@kaishome.de>

src/Makefile

@@ -3,7 +3,7 @@ PROGRAMS = \
 	../bin/fiemap \
 	../bin/fiewalk \
 
-all: $(PROGRAMS) depends.mk
+all: $(PROGRAMS)
 
 include ../makeflags