wordpress: Update to 4.7.5

[joneum]

Summary

• Update the Wordpress ports to 4.7.5
• Changes: https://wordpress.org/news/2017/05/wordpress-4-7-5/

Approved by: xxx (mentor)
MFH: 2017Q2
Security: http://vuxml.freebsd.org/freebsd/a5bb7ea0-3e58-11e7-94a2-00e04c1ea73d.html
#Differential Revision: https://reviews.freebsd.org/D10849

Test Plan

portlint -AC is fine

Poudriere testport:

10amd64
10i386
11amd64
11i386
12.0-CURRENT r318899 amd64
12.0-CURRENT r318400 i386

[joneum]

I think, it is posible, to commit this in 2017Q2.
When yes, please follow instructions about this way

[miwi]

Thats a security update, we need to MFH it, as well link to the vuxml.