Added a few rules to rebuild idl headers.

Make.rules.in

@@ -157,7 +157,7 @@ $(MODULE).dbg.c: $(C_SRCS) $(C_SRCS16) $(WINEBUILD)
 
 # Rule to rebuild the tools
 
-$(MAKEDEP) $(WINEBUILD) $(WMC) $(WRC):
+$(MAKEDEP) $(WIDL) $(WINEBUILD) $(WMC) $(WRC):
 	cd $(TOOLSDIR)/tools && $(MAKE) `basename $@`
 
 # Rules for makefile

include/Makefile.in

@@ -240,6 +240,12 @@ EXTRASUBDIRS = bitmaps msvcrt msvcrt/sys wine
 .idl.h:
 	$(LDPATH) $(WIDL) $(DEFS) -b -h -H $@ $<
 
+$(IDL_SRCS:.idl=.h): $(WIDL)
+
+.PHONY: idl
+
+idl: $(IDL_SRCS:.idl=.h)
+
 install::
 	$(MKINSTALLDIRS) $(includedir) $(includedir)/windows $(includedir)/msvcrt $(includedir)/msvcrt/sys
 	for f in $(WINDOWS_INCLUDES); do $(INSTALL_DATA) $(SRCDIR)/$$f $(includedir)/windows/$$f; done