Remove .SECONDARY directive

The presence of the .SECONDARY directive caused thing to not always
be correctly rebuilt.  Mentioning the object files explicitly as
targets gives the desired result of make not deleting them without
unpleasant side-effects.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@22422 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

common.mak

@@ -66,7 +66,7 @@ uninstall: uninstall-libs uninstall-headers
 .SUFFIXES:
 
 # Do not delete intermediate files from chains of implicit rules
-.SECONDARY:
+$(OBJS):
 endif
 
 OBJS-$(HAVE_MMX) +=  $(MMX-OBJS-yes)