gbuild: platform/WNT_INTEL_MSC: use subst in gb_Helper_convert_native

solenv/gbuild/platform/WNT_INTEL_MSC.mk

@@ -252,10 +252,10 @@ gb_Helper_set_ld_path := PATH="$${PATH}:$(OUTDIR)/bin"
 # does some real work only on windows, make sure not to
 # break the dummy implementations on unx*
 define gb_Helper_convert_native
-$(patsubst -I$(OUTDIR)%,-I$(gb_Helper_OUTDIR_NATIVE)%, \
-$(patsubst $(OUTDIR)%,$(gb_Helper_OUTDIR_NATIVE)%, \
-$(patsubst $(WORKDIR)%,$(gb_Helper_WORKDIR_NATIVE)%, \
-$(patsubst $(SRCDIR)%,$(gb_Helper_SRCDIR_NATIVE)%, \
+$(subst $(REPODIR),$(gb_Helper_REPODIR_NATIVE), \
+$(subst $(SRCDIR),$(gb_Helper_SRCDIR_NATIVE), \
+$(subst $(WORKDIR),$(gb_Helper_WORKDIR_NATIVE), \
+$(subst $(OUTDIR),$(gb_Helper_OUTDIR_NATIVE), \
 $(1)))))
 endef