testing/php7.1: switch to mysqlnd backendand and some more

At-last switch to mysqlnd - mysql php native backend.
All this time I thinked it was done. ((

* remove mariadb-dev from makedepends
* mysqlnd:
    - add strict dependency to openssl
* mysqli:
    - switch to use mysqlnd as a backend
    - suppress to send auth data on persistent connection pings
    - increase extension loading index to be load after mysqlnd
* pdo_mysql:
    - switch to use mysqlnd
* global:
    - add support for initial static extension dependency
    - remade loading index calculation.
      now it adds ... initiial+calculated.
    - sort configure flags to _extensions order
    - make configure flags more readable
    - shrink extensions dir to /usr/lib/php{ver}, without "modules"
      subdir. Because this directory for modules only.
    - some cosmetic cleanups.

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