Explicitly link against libicui18n so that libQtCore.so always finds it.

--- qt-everywhere-opensource-src-4.8.6/src/corelib/corelib.pro	2015-04-15 12:01:41.661862663 +0200
+++ qt-everywhere-opensource-src-4.8.6/src/corelib/corelib.pro	2015-04-15 12:03:57.954586336 +0200
@@ -19,6 +19,13 @@ include(codecs/codecs.pri)
 include(statemachine/statemachine.pri)
 include(xml/xml.pri)
 
+# Explicitly link with icui18n, which is dlopened by libQtCore.so.
+# We cannot do this by setting LDFLAGS because that then overrides
+# other LDFLAGS: <https://bugreports.qt.io/browse/QTBUG-5471>.
+# XXX: According to the Nixpkgs recipe, this may be necessary for
+# further libraries (cups, gtk-x11-2.0, libgdk-x11-2.0).
+LIBS_PRIVATE += -licui18n
+
 !qpa:mac|darwin:LIBS_PRIVATE += -framework ApplicationServices
 qpa:mac {
     !ios {
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