Replace FTP sources with HTTP or HTTPS

[JamieMagee]

Migrated from #1738.

Arch Linux^1 and NixOS^2 are useful references to identify alternative source locations

Packages identified using rg -l -g "*.spec" "ftp://" | xargs dirname | xargs basename -s | sort

• [ ] arpwatch
  • #3164
• [ ] aspell
  • #3189
• [ ] aspell-en
  • #3291
• [x] autoconf213
  • #3292
• [ ] colorize
  • https://github.com/raszi/colorize ?
• [ ] dhcp
  • https://downloads.isc.org/isc/${pkgbase}/${_realver}/${pkgbase}-${_realver}.tar.gz
• [ ] dialog
  • https://invisible-mirror.net/archives/$pkgname/$pkgname-${pkgver/_/-}.tgz
• [ ] diffstat
• [ ] docbook-utils
• [ ] freeradius
• [ ] freetds
• [ ] guile
• [ ] help2man
• [ ] hunspell-az
• [ ] hunspell-fa
• [ ] libfontenc
• [ ] libgsf
• [ ] librx
• [ ] libsmi
• [ ] libthai
• [ ] man-pages-it
• [ ] mpage
• [ ] mtools
• [ ] mtr
• [ ] mutt
• [ ] nvmetcli
• [ ] perl-DateTime-TimeZone
• [ ] perl-Net-Telnet
• [ ] plotutils
• [ ] postfix
• [ ] ppp
• [ ] procmail
• [ ] psacct
• [ ] python-alsa
• [ ] sendmail
• [ ] t1lib
• [ ] telnet
• [ ] time
• [ ] uuid
• [ ] xdelta
• [ ] xorg-x11-drv-libinput
• [x] xterm