message: Fix RPATH search for Qt 5.12 and Ubuntu 18.04
  Also use patchelf instead of chrpath, it works better
diff: @@ -74,11 +74,17 @@ cp $QPATH/plugins/platforms/libqxcb.so $out/plugins/platforms
  cp $QPATH/libexec/QtWebEngineProcess $out
  # Fix RPATH for plugin libraries and executables
  -chrpath -r '$ORIGIN/../../lib' $out/plugins/imageformats/libqsvg.so
  -chrpath -r '$ORIGIN/../../lib' $out/plugins/libqsvgicon.so
  -chrpath -r '$ORIGIN/../../lib' $out/plugins/libqxcb.so
  -chrpath -r '$ORIGIN/lib' $out/TogglDesktop
  -chrpath -r '$ORIGIN/lib' $out/QtWebEngineProcess
  +patchelf --set-rpath '$ORIGIN/../../lib' $out/plugins/imageformats/libqsvg.so
  +patchelf --set-rpath '$ORIGIN/../../lib' $out/plugins/libqsvgicon.so
  +patchelf --set-rpath '$ORIGIN/../../lib' $out/plugins/libqxcb.so
  +patchelf --set-rpath '$ORIGIN/lib' $out/TogglDesktop
  +patchelf --set-rpath '$ORIGIN/lib' $out/QtWebEngineProcess
  +for i in `ls -1 $out/lib/libPoco*`; do
  + patchelf --set-rpath '$ORIGIN' $i
  +done
  +for i in `ls -1 $out/lib/libicu*`; do
  + patchelf --set-rpath '$ORIGIN' $i
  +done
  # Copy QtWebEngine Resource files
  cp $QPATH/resources/* $out/resources
  