Fix localized build on OpenBSD.

Use the same set of langs as on Linux and FreeBSD (no Japanese), don't
redefine a needed macro as no-op, and unset LC_CTYPE in the environment
when building cat files.

cde/programs/localized/templates/header2.tmpl

@@ -14,6 +14,8 @@ target.cat : target.msg							@@\
 	@echo "Running mkcatdefs for $@ with LANG set to $(LANG)"	@@\
 	( \								@@\
 	  rm -f $@ target.tmp.msg; \					@@\
+	  LC_CTYPE=""; \						@@\
+	  export LC_CTYPE; \						@@\
 	  LANG=$(LANG); \						@@\
 	  export LANG; \						@@\
 	  $(MKCATTOOL) $(@:.cat=) $(@:.cat=.msg) -h > target.tmp.msg; \	@@\