Remove redundant bashcompinit calls

Fixes #9246

plugins/aws/aws.plugin.zsh

@@ -64,7 +64,6 @@ fi
 
 # AWS CLI v2 comes with its own autocompletion. Check if that is there, otherwise fall back
 if command -v aws_completer &> /dev/null; then
-  autoload -Uz bashcompinit && bashcompinit
   complete -C aws_completer aws
 else
   function _awscli-homebrew-installed() {

plugins/compleat/compleat.plugin.zsh

@@ -10,11 +10,8 @@ if (( ${+commands[compleat]} )); then
   local setup="${prefix}/share/compleat-1.0/compleat_setup" 
 
   if [[ -f "$setup" ]]; then
-    if ! bashcompinit >/dev/null 2>&1; then
-      autoload -U bashcompinit
-      bashcompinit -i
-    fi
-
     source "$setup" 
   fi
+
+  unset prefix setup
 fi

plugins/drush/drush.plugin.zsh

@@ -99,6 +99,4 @@ alias drvg="drush variable-get"
 alias drvs="drush variable-set"
 
 # Enable drush autocomplete support
-autoload bashcompinit
-bashcompinit
 source $(dirname $0)/drush.complete.sh

plugins/stack/stack.plugin.zsh

 (( $+commands[stack] )) || return
 
-autoload -U +X bashcompinit && bashcompinit
 source <(stack --bash-completion-script stack)

plugins/wp-cli/wp-cli.plugin.zsh

@@ -138,7 +138,6 @@ alias wpwm='wp widget move'
 alias wpwu='wp widget update'
 
 
-autoload -U +X bashcompinit && bashcompinit
 # bash completion for the `wp` command
 
 _wp_complete() {