patch 8.1.0478: cannot build with perl using MinGW
Problem: Cannot build with perl using MinGW.
Solution: Add -I. (Ken takata, Cesar Romani)
diff --git a/src/Make_cyg_ming.mak b/src/Make_cyg_ming.mak
index 65a1fbf..e213b80 100644
--- a/src/Make_cyg_ming.mak
+++ b/src/Make_cyg_ming.mak
@@ -1049,7 +1049,7 @@
$(PERLTYPEMAP) if_perl.xs -output $@
$(OUTDIR)/if_perl.o: auto/if_perl.c $(INCL)
- $(CC) -c $(CFLAGS) auto/if_perl.c -o $(OUTDIR)/if_perl.o
+ $(CC) -c $(CFLAGS) -I. auto/if_perl.c -o $(OUTDIR)/if_perl.o
$(OUTDIR)/if_ruby.o: if_ruby.c $(INCL)