Subject: upgrade to php 7.4

From: Andy Postnikov <[email-masked]>
Date: Sun, 14 Jun 2020 02:06:12 +0300

Hello,
I've prepared upgrade to PHP to 7.4.7 and suppose it is ready to be committed.
There's 2 MRs !2421 and !9179 (disable tests for php7 to run tests for
extensions to rebuild)
For final merge I expect 3 commits: upgrade php7, bump community and
testing extensions in 2.

Packages using php-fpm or mod-php still may have new notices and
warnings which needs sorting before 3.13 release (phpldapadmin for
example but mostly all adopted it last half of the year).

PS: General issue to track #11002

Andy