x11/xman - missing dependency

[Jan Beich]

Provide more details as current version builds fine on the package cluster:

http://beefy10.nyi.freebsd.org/data/latest-per-pkg/xman/1.1.5/112i386-default.log
http://beefy9.nyi.freebsd.org/data/latest-per-pkg/xman/1.1.5/112amd64-default.log
http://beefy5.nyi.freebsd.org/data/latest-per-pkg/xman/1.1.5/120i386-default.log
http://beefy6.nyi.freebsd.org/data/latest-per-pkg/xman/1.1.5/120amd64-default.log
http://beefy11.nyi.freebsd.org/data/latest-per-pkg/xman/1.1.5/head-i386-default.log
http://beefy12.nyi.freebsd.org/data/latest-per-pkg/xman/1.1.5/head-amd64-default.log
http://beefy8.nyi.freebsd.org/data/latest-per-pkg/xman/1.1.5/head-armv6-default.log
http://beefy12.nyi.freebsd.org/data/latest-per-pkg/xman/1.1.5/head-armv7-default.log
http://thunderx1.nyi.freebsd.org/data/latest-per-pkg/xman/1.1.5/head-arm64-default.log
http://beefy11.nyi.freebsd.org/data/latest-per-pkg/xman/1.1.5/head-mips64-default.log
http://pylon.nyi.freebsd.org/data/latest-per-pkg/xman/1.1.5/head-powerpc64-default.log