Integrate perlio:

[  8520]
More messing with Encode:
Extra fields in header to allow multiple names and to record
other things "compile" knows.
Re-organise compile to factor out common output routines.

[  8519]
Change file-of-files command line from -F to -f to avoid case issues on VMS.

p4raw-link: @8520 on //depot/perlio: dcda1f94ccf07b68dc3a74b49b117aa6026f2557
p4raw-link: @8519 on //depot/perlio: 3865e8e16e47e0d7cb9fff45bba4e84e396abd42

p4raw-id: //depot/perl@8521