Revert "Add brew link step for PHP on OSX"

This reverts commit 185061c.

Signed-off-by: Maurício Meneghini Fauth <mauriciofauth@gmail.com>

.travis.yml

@@ -79,7 +79,6 @@ matrix:
       before_install:
         - brew update
         - brew install openldap libiconv php@7.2 composer mariadb
-        - brew link --force php
         - brew link --force gettext
         - sed -i -e 's/^memory_limit = .*/memory_limit = -1/' /usr/local/etc/php/7.2/php.ini
         - mysql.server start