net-mgmt/bgpq4: Update to 1.4

• Update to 1.4
• Reformat a bit according to portclippy and portfmt
• Fix build dependency on libtool
• Changes: https://github.com/bgp/bgpq4/blob/1.4/CHANGES

Approved by: maintainer timeout (3 weeks)
Differential Revision: https://reviews.freebsd.org/D31681