crosstest: Fix the crosstest dependencies.

Make.rules.in

diff --git a/Make.rules.in b/Make.rules.in
index c01a2b7..7f72099 100644
--- a/Make.rules.in
+++ b/Make.rules.in
@@ -229,7 +229,7 @@
 	@cd `dirname $@` && $(MAKE) depend
 
 depend: $(SUBDIRS:%=%/__depend__) dummy
-	$(MAKEDEP) -C$(SRCDIR) -S$(TOPSRCDIR) -T$(TOPOBJDIR) $(EXTRAINCL) $(DEPEND_SRCS)
+	$(MAKEDEP) $(MAKEDEPFLAGS) -C$(SRCDIR) -S$(TOPSRCDIR) -T$(TOPOBJDIR) $(EXTRAINCL) $(DEPEND_SRCS)
 
 .PHONY: depend $(SUBDIRS:%=%/__depend__)
 

dlls/Maketest.rules.in

diff --git a/dlls/Maketest.rules.in b/dlls/Maketest.rules.in
index b112c45..aff002c 100644
--- a/dlls/Maketest.rules.in
+++ b/dlls/Maketest.rules.in
@@ -24,6 +24,7 @@
 CROSSTEST    = $(TESTDLL:%.dll=%)_crosstest.exe
 CROSSCC      = @CROSSCC@
 CROSSWINEGCC = $(TOOLSDIR)/tools/winegcc/winegcc @CROSSTARGETFLAGS@ -B$(TOOLSDIR)/tools/winebuild --sysroot=$(TOPOBJDIR)
+MAKEDEPFLAGS = -xo -xcross.o
 
 @MAKE_RULES@