Integrate perlio:
Jarkko Hietaniemi [Wed, 29 Nov 2000 16:27:49 +0000 (16:27 +0000)]
[  7906]
Initial tidy of setmode() muddle (UNIX does not have, nor need it).

p4raw-link: @7906 on //depot/perlio: a4d3c1d3a59a079ee84191d2df8b5e232a8bee44

p4raw-id: //depot/perl@7922


Trivial merge