Remove useless directory creation (leaving a locale/ directory behind)

--- po/Makefile.in.in.orig	2015-07-26 20:28:34.000000000 +0000
+++ po/Makefile.in.in	2015-07-26 20:29:04.000000000 +0000
@@ -97,7 +97,6 @@
 install-data: install-data-@USE_NLS@
 install-data-no: all
 install-data-yes: all
-	$(mkdir_p) $(DESTDIR)$(itlocaledir)
 	if test -n "$(PO_LINGUAS)"; then \
 	  linguas="$(PO_LINGUAS)"; \
 	else \
