Adam Strzelecki to SDL

This patch significantly speeds up make process (mostly noticeable on MinGW+MSYS) canceling implicit rules for dependencies and Makefile.in that caused lot of unnecessary file checks (in case of Windoze those are pretty slow). See "make -d" before and after applying this patch.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%404140

Makefile.in

@@ -62,6 +62,8 @@ $(srcdir)/configure: $(srcdir)/configure.in
 Makefile: $(srcdir)/Makefile.in
 	$(SHELL) config.status $@
 
+Makefile.in:;
+
 $(objects):
 	$(SHELL) $(auxdir)/mkinstalldirs $@
 
@@ -71,7 +73,7 @@ $(srcdir)/include/SDL_revision.h: update-revision
 update-revision:
 	$(SHELL) $(auxdir)/updaterev.sh
 
-.PHONY: all update-revision install install-bin install-hdrs install-lib install-data uninstall uninstall-bin uninstall-hdrs uninstall-lib uninstall-data clean distclean dist
+.PHONY: all update-revision install install-bin install-hdrs install-lib install-data uninstall uninstall-bin uninstall-hdrs uninstall-lib uninstall-data clean distclean dist $(OBJECTS:.lo=.d)
 
 -include $(OBJECTS:.lo=.d)
 @DEPENDS@