..FG...... [ZBXNEXT-1078] added 'proc.mem[]' 5-th parameter (memtype) on AIX, FreeBSD, Linux, Solaris

Before this change the item "proc.mem[]" on all supported platforms accepted 4 parameters
    proc.mem[<name>,<user>,<mode>,<cmdline>]
and only one type of process memory (e.g. virtual size).

After this change on AIX, FreeBSD, Linux and Solaris the "proc.mem[]" item accepts also the 5th parameter "memtype":
    proc.mem[<name>,<user>,<mode>,<cmdline>,<memtype>]
    
On NetBSD, OpenBSD, and Tru64 only 4 parameters are accepted as before.