[GTK][WPE] force libpsl build to use ICU in jhbuild

[GTK][WPE] force libpsl build to use ICU in jhbuild
https://bugs.webkit.org/show_bug.cgi?id=194288

Patch by Olivier Blin <olivier.blin@softathome.com> on 2019-02-05
Reviewed by Philippe Normand.

In jhbuild, libpsl depends on ICU, but its configure script may decide to use libidn instead of ICU.
This can cause build failures if libidn is detected but libunistring is not available.

Make sure that ICU is used for runtime and builtin PSL data.

* gtk/jhbuild.modules:
* wpe/jhbuild.modules:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@240987 268f45cc-cd09-0410-ab3c-d52691b4dbfc