Integrate perlio:
Jarkko Hietaniemi [Sun, 3 Dec 2000 17:35:56 +0000 (17:35 +0000)]
[  7961]
Make iperlsys.h vector stdio not PerlIO.

p4raw-link: @7961 on //depot/perlio: eaf8b6989fc5883b4cde6853803087e4b807b2b7

p4raw-id: //depot/perl@7964


Trivial merge