localcharset: Map the locale encodings found in newer OSes. * lib/localcharset.c (alias_table): Add mapping for locale encodings found in FreeBSD 11, NetBSD 7, Solaris 10, Openindiana, HP-UX 11.31, IRIX 6.5, Minix 3.3. * lib/localcharset.h: Update comments accordingly. Also for Cygwin 2.9.