Elm Patch 13 and some systems

[Syd Weinstein]

Some systems don't define errno in <errno.h>, for those, an
extern int errno;
needs to be added to src/elm.c to get it to compile.  I will add
that line to patch 14 when it comes out, for those that need it
now, just add the line.
-- 
=====================================================================
Sydney S. Weinstein, CDP, CCP                   Elm Coordinator
Datacomp Systems, Inc.				Voice: (215) 947-9900
syd at DSI.COM or {bpa,vu-vlsi}!dsinc!syd	        FAX:   (215) 938-0235