libpsl: Include icu bl3 in buildlink3 and add support for tests

- buildlink3 inclusion of textproc/icu was commented out in
  www/libpsl/buildlink3.mk but at least building (latest and still
  not committed) net/libsoup needs it, uncomment it.
- Add support for tests

www/libpsl/Makefile

@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.2 2018/07/29 14:17:06 bsiegert Exp $
+# $NetBSD: Makefile,v 1.3 2018/10/23 07:07:25 leot Exp $
 
 DISTNAME=	libpsl-0.20.2
 PKGREVISION=	1
@@ -24,6 +24,8 @@ CONFIGURE_ARGS+=	--enable-runtime=libicu
 
 PKGCONFIG_OVERRIDE+=	libpsl.pc.in
 
+TEST_TARGET=	check
+
 .include "../../lang/python/application.mk"
 .include "../../devel/gettext-lib/buildlink3.mk"
 .include "../../textproc/icu/buildlink3.mk"

www/libpsl/buildlink3.mk

@@ -1,4 +1,4 @@
-# $NetBSD: buildlink3.mk,v 1.1 2018/07/28 12:25:20 bsiegert Exp $
+# $NetBSD: buildlink3.mk,v 1.2 2018/10/23 07:07:25 leot Exp $
 
 BUILDLINK_TREE+=	libpsl
 
@@ -8,7 +8,7 @@ LIBPSL_BUILDLINK3_MK:=
 BUILDLINK_API_DEPENDS.libpsl+=	libpsl>=0.20.2
 BUILDLINK_PKGSRCDIR.libpsl?=	../../www/libpsl
 
-#.include "../../textproc/icu/buildlink3.mk"
+.include "../../textproc/icu/buildlink3.mk"
 .endif	# LIBPSL_BUILDLINK3_MK
 
 BUILDLINK_TREE+=	-libpsl