Do not unset LD_LIBRARY_PATH

https://github.com/probonopd/linuxdeployqt/pull/370#issuecomment-489515772

linuxdeployqt.AppDir/AppRun

@@ -1,5 +1,5 @@
 #!/bin/bash
 # This file is being used so that users don't have to unset env vars manually
 HERE="$(dirname "$(readlink -f "${0}")")"
-unset QTDIR; unset QT_PLUGIN_PATH ; unset LD_LIBRARY_PATH
+unset QTDIR; unset QT_PLUGIN_PATH # Do not unset LD_LIBRARY_PATH; https://github.com/probonopd/linuxdeployqt/pull/370#issuecomment-489515772
 exec "${HERE}/usr/bin/linuxdeployqt" "$@"