wp_check_php_mysql_versions() during setup and install. see #17934.

git-svn-id: https://develop.svn.wordpress.org/trunk@18374 602fd350-edb4-49c9-b593-d223f7449a82

wp-settings.php

@@ -23,6 +23,9 @@ require( ABSPATH . WPINC . '/version.php' );
 // Set initial default constants including WP_MEMORY_LIMIT, WP_MAX_MEMORY_LIMIT, WP_DEBUG, WP_CONTENT_DIR and WP_CACHE.
 wp_initial_constants( );
 
+// Check for the required PHP version and for the MySQL extension or a database drop-in.
+wp_check_php_mysql_versions();
+
 // Disable magic quotes at runtime. Magic quotes are added using wpdb later in wp-settings.php.
 set_magic_quotes_runtime( 0 );
 @ini_set( 'magic_quotes_sybase', 0 );
@@ -40,9 +43,6 @@ unset( $wp_filter, $cache_lastcommentmodified );
 // Standardize $_SERVER variables across setups.
 wp_fix_server_vars();
 
-// Check for the required PHP version and for the MySQL extension or a database drop-in.
-wp_check_php_mysql_versions();
-
 // Check if we have received a request due to missing favicon.ico
 wp_favicon_request();