Merge branch 'master' of git.php.net:/pecl/database/pq

* 'master' of git.php.net:/pecl/database/pq:
  support PostgreSQL down to 9.0; JSON is optional
  back to dev
  fix pqcur minit and mshutdown
Merge branch 'master' of git.php.net:/pecl/database/pq

* 'master' of git.php.net:/pecl/database/pq:
  better checks for json support
  prepare 0.5.2
Merge branch 'master' of git.php.net:/pecl/database/pq

* 'master' of git.php.net:/pecl/database/pq:
  prepare 0.5.2
get rid of remaining HAVE_JSON, use PHP_PQ_HAVE_PHP_JSON_H everywhere