ENOTSUP not in SCO =(

[Jeff Bailey]

ENOTSUP doesn't seem to be present in Sco Openserver.  I notice that
all the instances in mailbox were changed to ENOSYS (which seems to
work fine).

Ok to make that change?  It only seems to appear in the one place.

gcc -DHAVE_CONFIG_H -I. -I. -I.. -I../include -I../lib -I../argp  
-DSYSCONFDIR=\"/usr/local/etc\"  -g -O2 -c `test -f svcb.c || echo './'`svcb.c
svcb.c: In function `sv_redirect':
svcb.c:240: `ENOTSUP' undeclared (first use in this function)
svcb.c:240: (Each undeclared identifier is reported only once
svcb.c:240: for each function it appears in.)


-- 
I gotta ding ding dang a dang a long ding dong.