Reindent the PerlIO files (suggested by NI-S), used

Reindent the PerlIO files (suggested by NI-S), used
indent -kr -nce -psl -sc -TSV -TAV -THV -TGV -TIV -TUV -TNV -TMAGIC -TFILE -TPerlIO -TPerlIO_list_t -TPerlIO_funcs -TPerlIO_pair_t
(GNU indent).  Note that wholesale re-indenting might
be nice, but that would break nice formatting/alignment
of assignments, equality testing, and complex boolean
expressions with lots of &s and |s.

p4raw-id: //depot/perl@12052