Add rule for generating .i (preprocessed) files from .c files

reactos/tools

diff -u -r1.62 -r1.63
--- helper.mk	17 May 2004 19:45:10 -0000	1.62
+++ helper.mk	28 May 2004 18:16:46 -0000	1.63
@@ -1,4 +1,4 @@

-# $Id: helper.mk,v 1.62 2004/05/17 19:45:10 gvg Exp $

+# $Id: helper.mk,v 1.63 2004/05/28 18:16:46 gvg Exp $

 #
 # Helper makefile for ReactOS modules
 # Variables this makefile accepts:

@@ -1064,6 +1064,8 @@

 	$(WINEBUILD) $(DEFS) -o $@ --def $<
 %.drv.spec.def: %.spec
 	$(WINEBUILD) $(DEFS) -o $@ --def $<

+%.i: %.c
+	$(CC) $(TARGET_CFLAGS) -E $< > $@

 # Kill implicit rule
 .o:;