Integrate perlio:

[  8026]
Various oddities p4 diff -se showed up
Remove 'our' from warnings.pl

[  8025]
Change PerlIO_(get|set)pos to take SV *
Should fix, OS/2, VMS, (sfio??)

p4raw-link: @8026 on //depot/perlio: 0ca4541c317eb395329cac582e39db540241d553
p4raw-link: @8025 on //depot/perlio: 766a733e849204725c27391cf2992d649af4aba6

p4raw-id: //depot/perl@8029

diff --cc perlio.c
Simple merge