www/bozohttpd: Mark BROKEN on i386

Failed to compile with the following error:
"comparison of integers of different signs: 'unsigned int' and
'time_t' (aka 'int') [-Werror,-Wsign-compare]"

Reference: https://portsfallout.com/fallout?port=www%2Fbozohttpd%24&page=1

PR: 259181
Reported by: pkg-fallout
Approved by: port maintainer timeout (2+ weeks), arrowd (mentor)
Differential Revision: https://reviews.freebsd.org/D32770