Prohibit ctype APIs (except toupper() which is still used by file.c - make
that deprecated).

Also remove a few tabs that were in there.

Change-Id: I1bb2ad726828366a9f7d1a4064b1215b743ad3b5
Reviewed-on: https://code.wireshark.org/review/5000
Reviewed-by: Michael Mann <mmann78@netscape.net>