remove HOMEBREW_SSH_PATH

Library/Homebrew/brew.sh

@@ -404,9 +404,6 @@ setup_ssh() {
      "${HOMEBREW_BREWED_SSH_PATH}" -V &>/dev/null
   then
     HOMEBREW_SSH="${HOMEBREW_BREWED_SSH_PATH}"
-  elif [[ -n "${HOMEBREW_SSH_PATH}" ]]
-  then
-    HOMEBREW_SSH="${HOMEBREW_SSH_PATH}"
   else
     HOMEBREW_SSH="ssh"
   fi

Library/Homebrew/env_config.rb

@@ -324,10 +324,6 @@ module Homebrew
                       "`git` repos over `ssh`.",
         default_text: "`$HOME/.ssh/config`",
       },
-      HOMEBREW_SSH_PATH:                         {
-        description:  "Set this value to a new enough `ssh` executable for Homebrew to use.",
-        default_text: "ssh",
-      },
       HOMEBREW_SKIP_OR_LATER_BOTTLES:            {
         description: "If set along with `HOMEBREW_DEVELOPER`, do not use bottles from older versions " \
                      "of macOS. This is useful in development on new macOS versions.",

docs/Manpage.md

@@ -2173,11 +2173,6 @@ example, run `export HOMEBREW_NO_INSECURE_REDIRECT=1` rather than just
 
   *Default:* `$HOME/.ssh/config`
 
-- `HOMEBREW_SSH_PATH`
-  <br>Set this value to a new enough `ssh` executable for Homebrew to use.
-
-  *Default:* `ssh`.
-
 - `HOMEBREW_SKIP_OR_LATER_BOTTLES`
   <br>If set along with `HOMEBREW_DEVELOPER`, do not use bottles from older versions of macOS. This is useful in development on new macOS versions.