profiles::http::system has an implicit dependency on PHP

[hmlth]

Apache start fails because the php directive is not understood:

May 03 13:58:07 critical1 systemd[1]: Starting LSB: Apache2 web server...
May 03 13:58:07 critical1 apache2[30769]: Starting web server: apache2 failed!
May 03 13:58:07 critical1 apache2[30769]: The apache2 configtest failed. ... (warning).
May 03 13:58:07 critical1 apache2[30769]: Output of config test was:
May 03 13:58:07 critical1 apache2[30769]: AH00526: Syntax error on line 19 of /etc/apache2/sites-enabled/25-critical_system.conf:
May 03 13:58:07 critical1 apache2[30769]: Invalid command 'php_admin_flag', perhaps misspelled or defined by a module not included in the server configuration
May 03 13:58:07 critical1 apache2[30769]: Action 'configtest' failed.
May 03 13:58:07 critical1 apache2[30769]: The Apache error log may have more information.