www/spawn-fcgi: Update version 1.6.3 => 1.6.4 and switch maintainers

Maintainership passed to submitter with blessing of former maintainer

PR:		192041
Submitted by:	rsimmons0 (gmail)
Approved by:	former maintainer (Dmitry Reshetnikov)
Merge pull request #292 from reallyenglish/mitsuruy

www/spawn-fcgi: Update version 1.6.3 => 1.6.4 and switch maintainers