re PR bootstrap/46812 (Linux libgo compilation fails when a "libnet" is already installed)

	PR bootstrap/46812
Add explicit -I . when building libgo.

From-SVN: r167668

libgo/Makefile.am

@@ -1291,7 +1291,7 @@ BUILDARCHIVE = \
 	test -d $(@D) || $(MKDIR_P) $(@D); \
 	rm -f $@; \
 	files=`echo $^ | sed -e 's/[^ ]*\.gox//g'`; \
-	if $(LTGOCOMPILE) -c -fgo-prefix="libgo_$(@D)" -o $@.$(OBJEXT) $$files; then \
+	if $(LTGOCOMPILE) -I . -c -fgo-prefix="libgo_$(@D)" -o $@.$(OBJEXT) $$files; then \
 	  $(AR) rc $@ $@.$(OBJEXT); \
 	else exit 1; fi
 

libgo/Makefile.in

@@ -1586,7 +1586,7 @@ BUILDARCHIVE = \
 	test -d $(@D) || $(MKDIR_P) $(@D); \
 	rm -f $@; \
 	files=`echo $^ | sed -e 's/[^ ]*\.gox//g'`; \
-	if $(LTGOCOMPILE) -c -fgo-prefix="libgo_$(@D)" -o $@.$(OBJEXT) $$files; then \
+	if $(LTGOCOMPILE) -I . -c -fgo-prefix="libgo_$(@D)" -o $@.$(OBJEXT) $$files; then \
 	  $(AR) rc $@ $@.$(OBJEXT); \
 	else exit 1; fi