Zabbix

.......PS. [ZBX-11864] Fixed failure on simple HTTPS checks if IPv6 is used

The problem relied on the fact that the square brackets were not correctly
added to the ip for being passed to libCURL. Added a check if the host is
an IPv6 and made the is_ip6() function generally available.
If the host is an IPv6, the square brackets will be added around the IP during
URL composition.

[svn merge -c 66383 ^/branches/3.2]

Resolved conflict in:
	src/libs/zbxcommon/misc.c