mcabber update; add proc and exec to pledge for password_eval option

The configuration setting "password_eval" requires to call an external
program like the "events_command" setting. So enable proc and exec when
pledging if that setting is available too. Tested with gpg as a password
provider.

Index: Makefile
===================================================================
RCS file: /cvs/ports/net/mcabber/Makefile,v
retrieving revision 1.35
diff -u -p -r1.35 Makefile
--- Makefile 27 Jun 2018 21:04:00 -0000 1.35
+++ Makefile 5 Mar 2019 16:27:51 -0000
@@ -3,7 +3,7 @@
COMMENT= console jabber client
DISTNAME= mcabber-1.1.0
CATEGORIES= net
-REVISION= 2
+REVISION= 3

HOMEPAGE= https://mcabber.com/

Index: patches/patch-mcabber_main_c
===================================================================
RCS file: /cvs/ports/net/mcabber/patches/patch-mcabber_main_c,v
retrieving revision 1.2
diff -u -p -r1.2 patch-mcabber_main_c
--- patches/patch-mcabber_main_c 26 May 2017 10:34:53 -0000 1.2
+++ patches/patch-mcabber_main_c 5 Mar 2019 16:27:51 -0000
@@ -6,7 +6,7 @@ Index: mcabber/main.c
if (ret == -2)
exit(EXIT_FAILURE);

-+ if (settings_opt_get("events_command")) {
++ if (settings_opt_get("events_command") || settings_opt_get("password_eval")) {
+ if (pledge("stdio rpath wpath cpath fattr inet dns tty proc exec", NULL) ==
+ -1) {
+ fprintf(stderr, "Cannot pledge: %s\n", strerror(errno));