Small fix for users that get "Spurious argument" on every search query

Not sure if this is just my installation, but it definitely doesn't want to work without this being declared global

functions/imap_asearch.php

@@ -31,6 +31,7 @@ $imap_asearch_debug_dump = FALSE;
 /** Imap SEARCH keys
 * @global array $imap_asearch_opcodes
 */
+global $imap_asearch_opcodes;
 $imap_asearch_opcodes = array(
 /* <sequence-set> => 'asequence', */	// Special handling, @see sqimap_asearch_build_criteria()
 /*'ALL' is binary operator */