Cope with newer alpine/c-client, from slackware
https://git.slackware.nl/current/diff/source/n/php/php.imap.api.diff?id=4f9273afa49a94b04bccc088fb87fec9d80a3fc6

Index: ext/imap/config.m4
--- ext/imap/config.m4.orig
+++ ext/imap/config.m4
@@ -46,6 +46,7 @@ AC_DEFUN([PHP_IMAP_TEST_BUILD], [
     PHP_IMAP_EXPORT void mm_nocritical(void){}
     PHP_IMAP_EXPORT void mm_notify(void){}
     PHP_IMAP_EXPORT void mm_login(void){}
+    PHP_IMAP_EXPORT void mm_login_method(void){}
     PHP_IMAP_EXPORT void mm_diskerror(void){}
     PHP_IMAP_EXPORT void mm_status(void){}
     PHP_IMAP_EXPORT void mm_lsub(void){}
@@ -282,6 +283,7 @@ if test "$PHP_IMAP" != "no"; then
       PHP_IMAP_EXPORT void mm_nocritical(void){}
       PHP_IMAP_EXPORT void mm_notify(void){}
       PHP_IMAP_EXPORT void mm_login(void){}
+      PHP_IMAP_EXPORT void mm_login_method(void){}
       PHP_IMAP_EXPORT void mm_diskerror(void){}
       PHP_IMAP_EXPORT void mm_status(void){}
       PHP_IMAP_EXPORT void mm_lsub(void){}