devel/php-libawl: Update to 0.60 and flavorize it.

• take maintainership (three time-outs)
• modify www/davical due to flavorized linawl
• flavorize www/davical

PR: 236649
Reported by: rearnsha <rwe@eyrie.plus.com>
Reviewed by: mat
Approved by: tcberner
Differential Revision: https://reviews.freebsd.org/D19653