gitweb: esc_html() site name for title in OPML
gitweb: esc_html() site name for title in OPML

This escapes the site name in OPML (XML uses the same escaping rules
as HTML).  Also fixes encoding issues because esc_html() uses
to_utf8().

Signed-off-by: Jürgen Kreileder <68a658b44bbaefab3ef5cd231967195fc0ff9d69@blackdown.de>
Acked-by: Jakub Narębski <a6a1517a087f9f64a72f41a0de57ff01fbb0e412@gmail.com>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git