MFH: r432090

Fix x11-wm/fluxbox: fails to build with clang 4.0

Import upstream commit
http://git.fluxbox.org/fluxbox.git/commit/util/fluxbox-remote.cc?id=22866c4d30f5b289c429c5ca88d800200db4fc4f
for issue
https://sourceforge.net/p/fluxbox/bugs/1138/

PR: 216176
Approved by: portmgr blanket, rakuco (mentor)

Approved by: ports-secteam (junovitch), rakuco (mentor)