Use strcasecmp() instead of strcmp() when checking user-supplied encoding
names so that encoding names are treated as case-insensitive.  This allows
the use of 'utf-8' instead of 'UTF-8' for example and matches the behavior
of iconv(1).

PR:		167977
Submitted by:	buganini@gmail.com
MFC after:	1 week
Remove blank lines.
mdoc: fix AUTHORS section.