[patch] new pty allocation strategy for BSD

[Roland Illig]

Hi,

subshell.c currently contains hard-coded values for the available pty 
names. These names do not match with the ptys that can be found on 
actual systems. NetBSD 3.0 has ptyp[0-9A-Za-z], as well as 
pty[qrs][0-9A-Za-z], so mc can only use 64 of the 100 available ptys.

There may be similar issues on other systems, I haven't checked.

The appended patch just scans through the /dev/ directory, looking for 
anything that matches /^pty..$/.

Roland
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