debian/gitweb: apache configuration requires mod_mime
A configuration without mod_mime enabled fails to load:
apache2_invoke: Enable configuration gitweb
apache2_reload: Your configuration is broken. Not reloading Apache 2
apache2_reload: AH00526: Syntax error on line 15 of /etc/apache2/conf-enabled/gitweb.conf:
apache2_reload: Invalid command 'AddHandler', perhaps misspelled or defined by a module not included in the server configuration
Declare the dependency on mod_mime so the /gitweb site can be
automatically disabled when mod_mime is disabled.
Reported-by: Uwe Storbeck <uwe@ibr.ch>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>