Log Message:
www/php-fpm: Run autoconf under CONFIGURE_ENV.

The same change as jperkin@ did.  (Thank you!)

Without this, depending on the user's LANG, the configure stage can break due
to the --disable-pdo option being parsed after the checks for individual PDO
modules, which then fail.  Something in the maze of m4 includes is dependent on
the locale for correct ordering when generating configure.