Restore some more rules to common.mak to improve building in subdirs.

Signed-off-by: NReimar Döffinger <Reimar.Doeffinger@gmx.de>

Makefile

@@ -7,9 +7,6 @@ vpath %.asm  $(SRC_PATH)
 vpath %.v    $(SRC_PATH)
 vpath %.texi $(SRC_PATH)
 
-# Do not delete intermediate files from chains of implicit rules
-$(OBJS):
-
 PROGS-$(CONFIG_FFMPEG)   += ffmpeg
 PROGS-$(CONFIG_FFPLAY)   += ffplay
 PROGS-$(CONFIG_FFPROBE)  += ffprobe
@@ -153,13 +150,5 @@ check: test
 include doc/Makefile
 include tests/Makefile
 
-# Dummy rule to stop make trying to rebuild removed or renamed headers
-%.h:
-	@:
-
-# Disable suffix rules.  Most of the builtin rules are suffix rules,
-# so this saves some time on slow systems.
-.SUFFIXES:
-
 .PHONY: all alltools *clean check config examples install*
 .PHONY: testprogs uninstall*

common.mak

@@ -49,6 +49,16 @@ HOSTCFLAGS += $(IFLAGS)
 
 %.c %.h: TAG = GEN
 
+# Dummy rule to stop make trying to rebuild removed or renamed headers
+%.h:
+	@:
+
+# Disable suffix rules.  Most of the builtin rules are suffix rules,
+# so this saves some time on slow systems.
+.SUFFIXES:
+
+# Do not delete intermediate files from chains of implicit rules
+$(OBJS):
 endif
 
 OBJS-$(HAVE_MMX) +=  $(MMX-OBJS-yes)