Prevent bailout during imap shutdown error reporting

This is a non-intrusive, minimal fix for bug #81316, which prevents
a bailout during imap RSHUTDOWN and prevents the basic shutdown
handler from being skipped.

I wasn't able to make the issue reproduce in a small test.

Author: nikic

ext/imap/php_imap.c

@@ -1099,7 +1099,9 @@ PHP_RSHUTDOWN_FUNCTION(imap)
 		if (EG(error_reporting) & E_NOTICE) {
 			ecur = IMAPG(imap_errorstack);
 			while (ecur != NIL) {
-				php_error_docref(NULL, E_NOTICE, "%s (errflg=%ld)", ecur->LTEXT, ecur->errflg);
+				zend_try {
+					php_error_docref(NULL, E_NOTICE, "%s (errflg=%ld)", ecur->LTEXT, ecur->errflg);
+				} zend_end_try();
 				ecur = ecur->next;
 			}
 		}
@@ -1112,7 +1114,9 @@ PHP_RSHUTDOWN_FUNCTION(imap)
 		if (EG(error_reporting) & E_NOTICE) {
 			acur = IMAPG(imap_alertstack);
 			while (acur != NIL) {
-				php_error_docref(NULL, E_NOTICE, "%s", acur->LTEXT);
+				zend_try {
+					php_error_docref(NULL, E_NOTICE, "%s", acur->LTEXT);
+				} zend_end_try();
 				acur = acur->next;
 			}
 		}