fping 5.1

Bugfixes and other changes

• Use setcap to specify specific files in fping.spec (#232, thanks @zdyxry)
• Netdata: use host instead name as family label (#226, thanks @k0ste)
• Netdata: use formatstring macro PRId64 (#229, thanks @gsnw)
• Allow -4 option to be given multiple times (#215, thanks @normanr)
• Documentation fix (#208, thanks @timgates42)
• Retain privileges until after privileged setsockopt (#200, thanks @simetnicbr)
• Set bind to source only when option is set (#198, thanks @dinoex)
• Update Azure test pipeline (#197, thanks @gsnw)
• Fix getnameinfo not called properly for IPv4 (#227, thanks @aafbsd)
• Fixed wrong timestamp under Free- and OpenBSD and macOS (#217, thanks @gsnw)
• Documentation updates (#240, thanks @auerswal)
• Updated autotools (autoconf 2.71, automake 1.16.5, libtool 2.4.6)