Pass the -J option to wrc to avoid including installed headers.

diff --git a/Make.rules.in b/Make.rules.in
index affddee..90cf965 100644
--- a/Make.rules.in
+++ b/Make.rules.in
@@ -70,11 +70,12 @@
 WRC          = $(TOOLSDIR)/tools/wrc/wrc
 WMC          = $(TOOLSDIR)/tools/wmc/wmc
 WIDL         = $(TOOLSDIR)/tools/widl/widl
-LDPATH    = @LDPATH@
-DLLDIR    = $(TOPOBJDIR)/dlls
-LIBWINE   = -L$(TOPOBJDIR)/library -lwine
-LIBUNICODE= -L$(TOPOBJDIR)/unicode -lwine_unicode
-LIBUUID   = -L$(TOPOBJDIR)/ole -lwine_uuid
+WRCFLAGS     = -J -m $(EXTRAWRCFLAGS)
+LDPATH       = @LDPATH@
+DLLDIR       = $(TOPOBJDIR)/dlls
+LIBWINE      = -L$(TOPOBJDIR)/library -lwine
+LIBUNICODE   = -L$(TOPOBJDIR)/unicode -lwine_unicode
+LIBUUID      = -L$(TOPOBJDIR)/ole -lwine_uuid
 
 @SET_MAKE@