Disable suffix rules

Most of the make builtin rules, which we do not need, are suffix rules,
and we use only new-style pattern rules.  Disabling suffix rules saves
some time when building on slow systems.

Originally committed as revision 22064 to svn://svn.ffmpeg.org/ffmpeg/trunk

common.mak

@@ -51,6 +51,10 @@ install: install-libs install-headers
 uninstall: uninstall-libs uninstall-headers
 
 .PHONY: all depend dep *clean install* uninstall* examples testprogs
+
+# Disable suffix rules.  Most of the builtin rules are suffix rules,
+# so this saves some time on slow systems.
+.SUFFIXES:
 endif
 
 OBJS-$(HAVE_MMX) +=  $(MMX-OBJS-yes)