Integrate perlio:
Jarkko Hietaniemi [Thu, 29 Mar 2001 16:29:17 +0000 (16:29 +0000)]
[  9448]
Make sure buildext.pl finds Errno.pm

p4raw-link: @9448 on //depot/perlio: 0026721a5b588a091ec5fe2016e8d00b8be712ab

p4raw-id: //depot/perl@9450


Trivial merge