Patch meta_key index on Posts 2 Posts plugin

posts-to-posts_schema.patch

diff --git a/wp-content/plugins/posts-to-posts/vendor/scribu/lib-posts-to-posts/storage.php b/wp-content/plugins/posts-to-posts/vendor/scribu/lib-posts-to-posts/storage.php
index cede3e8e..e60fa99b 100644
--- a/wp-content/plugins/posts-to-posts/vendor/scribu/lib-posts-to-posts/storage.php
+++ b/wp-content/plugins/posts-to-posts/vendor/scribu/lib-posts-to-posts/storage.php
@@ -27,6 +27,7 @@ class P2P_Storage {
 			KEY p2p_type (p2p_type)
 		" );
 
+		// @see /wp-admin/includes/schema.php:53 - for "KEY meta_key (meta_key(191))" change
 		scb_install_table( 'p2pmeta', "
 			meta_id bigint(20) unsigned NOT NULL auto_increment,
 			p2p_id bigint(20) unsigned NOT NULL default '0',
@@ -34,7 +35,7 @@ class P2P_Storage {
 			meta_value longtext,
 			PRIMARY KEY  (meta_id),
 			KEY p2p_id (p2p_id),
-			KEY meta_key (meta_key)
+			KEY meta_key (meta_key(191))
 		" );
 	}