Add known necessary formulas

[akerl]

• [x] zsh-completions
• [x] zsh
• [x] xz
• [x] wget
• [x] webp
• [x] watch
• [x] voyager
• [x] unibilium
• [x] tree
• [x] terraform
• [x] speculate
• [x] sparkey
• [x] slacker
• [x] screen
• [x] ripgrep
• [x] readline
• [x] rclone
• [x] pwgen
• [x] pkg-config
• [x] pinentry
• [x] phantomjs
• [x] pcre
• [x] p11-kit
• [x] openssl
• [x] openssh
• [x] opensc
• [x] npth
• [x] nmap
• [x] nettle
• [x] netcat
• [x] mtr
• [x] mpfr
• [x] madlibrarian
• [x] libyaml
• [x] libxslt
• [x] libxml2
• [x] libusb
• [x] libunistring
• [x] libtool
• [x] libtiff
• [x] libtasn1
• [x] libssh2
• [x] libpng
• [x] libmpc
• [x] libksba
• [x] libgpg-error
• [x] libgcrypt
• [x] libffi
• [x] libassuan
• [x] ledger
• [x] keybase
• [x] jpeg
• [x] isl
• [x] ipmitool
• [x] htop
• [x] grep
• [x] go
• [x] gnupg
• [x] gnu-tar
• [x] gnu-sed
• [x] gmp
• [x] glib
• [x] git
• [x] giflib
• [x] gettext
• [x] gdbm
• [x] gd
• [x] gcc
• [x] freetype
• [x] fontconfig
• [x] findutils
• [x] etcher
• [x] direnv
• [x] diff-so-fancy
• [x] coreutils
• [x] cmake
• [x] choose
• [x] boost-python
• [x] boost
• [x] bind
• [x] bash-completion
• [x] bash
• [x] automake
• [x] autoconf
• [x] adns
• [x] utf8proc
• [x] tmux
• [x] thyme
• [x] swig
• [x] sqlite
• [x] sphinx-doc
• [x] socat
• [x] snappy
• [x] shellcheck
• [x] python3
• [x] python
• [x] pygtk
• [x] pick
• [x] neovim
• [x] luajit
• [x] lua
• [x] libvterm
• [x] libuv
• [x] atk
• [x] cabal-install
• [x] curl
• [x] c-ares
• [x] ghc
• [x] gobject-introspection
• [x] gnutls
• [x] gpgme
• [x] graphviz
• [x] gtk+
• [x] icu4c
• [x] ipcalc
• [x] jemalloc
• [x] ldns
• [x] libevent
• [x] libglade
• [x] libtermkey
• [x] msgpack
• [x] nghttp2
• [x] pandoc
• [x] perl
• [x] py2cairo
• [x] pygobject
• [x] rust
• [x] tcl-tk
• [x] guile
• [x] unbound
• [x] pth
  • [x] autocone
  • [x] bdw-gc
  • [x] cairo
  • [x] cunit
  • [x] doxygen
  • [x] gdk-pixbuf
  • [x] gtk-doc
  • [x] gts
  • [x] hicolor-icon-theme
  • [x] jansson
  • [x] jasper
  • [x] libev
  • [x] librsvg
  • [x] llvm
  • [x] pango
  • [x] spdylay
  • [x] harfbuzz
  • [x] itstool
  • [x] libatomic_ops
  • [x] libcroco
  • [x] netpbm
  • [x] ocaml
  • [x] pixman
  • [x] qt
  • [x] source-highlight

[akerl]

Done!