www/rubygem-passenger: Fix build with utf8cpp 4.0.3+
- Update version requirement of BUILD_DEPENDS to avoid using utf8cpp 4.0.2
utf8cpp 3.* installs to ${PREFIX}/include/utf8cpp/.
utf8cpp 4.0.{0,1,2} changes to ${PREFIX}/include/.
utf8cpp 4.0.3 changes back to ${PREFIX}/include/utf8cpp/.
PR: 275776
Reported by: Toshimichi Masubuchi <t.masub@gmail.com>