From: Thomas Zenker <thz@Lennartz-electronic.DE>
* rdi-share/hsys.c: to compile under 4.4BSD derived systems (FreeBSD,
NetBSD...) sys_errlist should not be declared in hsys.c.
NEED_SYSERRLIST is set already by configure, so we can use it.
* rdi-share/unixcomm.c: 4.4BSD derived systems define BSD, but are
posix compliant and we should not work with the old compatibility
stuff. Because of that I undef BSD in case of FBSD etc and include
sys/ioctl to get the flags.
* rdi-share/unixcomm.c: If the TIOCEXCL flags exists set serial line
for exclusive use.
