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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<tr><td><span title='2019-06-14 23:18:12 +0200'>2019-06-14</span></td><td><a href='/guix/commit/gnu/packages/benchmark.scm?id=4c7e8c234d7d1729adf7290a8bb761e3a0cc4b6b'>gnu: Add benchmark.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/benchmark.scm(benchmark): New variable.
* gnu/packages/patches/benchmark-unbundle-googletest.patch: New file.
* gnu/local.mk(dist_patch_DATA): Add it.
</span></span></td><td>Gábor Boskovits</td></tr>
<tr><td><span title='2019-06-06 05:59:00 +0200'>2019-06-06</span></td><td><a href='/guix/commit/gnu/packages/benchmark.scm?id=28548efe825eaa7218a646b5e3fc19d0bd421319'>gnu: fio: Update to 3.14.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/benchmark.scm (fio): Update to 3.14.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-03-15 16:20:29 +0100'>2019-03-15</span></td><td><a href='/guix/commit/gnu/packages/benchmark.scm?id=ce32ce70475254bd5686f8ca77048127037bc87d'>gnu: fio: Update to 3.13.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/benchmark.scm (fio): Update to 3.13.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2019-03-06 21:55:14 +0100'>2019-03-06</span></td><td><a href='/guix/commit/gnu/packages/benchmark.scm?id=61e265d2946a72382887f8e966f5b644affc37ca'>gnu: Add multitime.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/benchmark.scm (multitime): New variable.
</span></span></td><td>Ricardo Wurmus</td></tr>