minor: Fix WARN_CREATE_GLOBAL warnings issued by zsh 5.1.1-dev-0.

The following warnings are issued by zsh as of zsh-workers/37018 (commit
de9effbce601 to zsh itself):

_zsh_highlight_main_highlighter_highlight_dollar_string:17: array parameter match created globally in function _zsh_highlight_main_highlighter_highlight_dollar_string
_zsh_highlight_main_highlighter_highlight_dollar_string:17: array parameter mbegin created globally in function _zsh_highlight_main_highlighter_highlight_dollar_string
_zsh_highlight_main_highlighter_highlight_dollar_string:17: array parameter mend created globally in function _zsh_highlight_main_highlighter_highlight_dollar_string
_zsh_highlight_main_highlighter_highlight_dollar_string:17: numeric parameter parameter MBEGIN created globally in function _zsh_highlight_main_highlighter_highlight_dollar_string
_zsh_highlight_main_highlighter_highlight_dollar_string:17: numeric parameter parameter MEND created globally in function _zsh_highlight_main_highlighter_highlight_dollar_string
_zsh_highlight_main_highlighter_highlight_dollar_string:17: scalar parameter MATCH created globally in function _zsh_highlight_main_highlighter_highlight_dollar_string
_zsh_highlight_main_highlighter_highlight_string:11: array parameter match created globally in function _zsh_highlight_main_highlighter_highlight_string
_zsh_highlight_main_highlighter_highlight_string:11: array parameter mbegin created globally in function _zsh_highlight_main_highlighter_highlight_string
_zsh_highlight_main_highlighter_highlight_string:11: array parameter mend created globally in function _zsh_highlight_main_highlighter_highlight_string
_zsh_highlight_main_highlighter_highlight_string:11: numeric parameter parameter MBEGIN created globally in function _zsh_highlight_main_highlighter_highlight_string
_zsh_highlight_main_highlighter_highlight_string:11: numeric parameter parameter MEND created globally in function _zsh_highlight_main_highlighter_highlight_string
_zsh_highlight_main_highlighter_highlight_string:11: scalar parameter MATCH created globally in function _zsh_highlight_main_highlighter_highlight_string

Author: danielshahaf

highlighters/main/main-highlighter.zsh

@@ -389,6 +389,8 @@ _zsh_highlight_main_highlighter_check_path()
 _zsh_highlight_main_highlighter_highlight_string()
 {
   setopt localoptions noksharrays
+  local -a match mbegin mend
+  local MATCH; integer MBEGIN MEND
   local i j k style
   # Starting quote is at 1, so start parsing at offset 2 in the string.
   for (( i = 2 ; i < end_pos - start_pos ; i += 1 )) ; do
@@ -423,6 +425,8 @@ _zsh_highlight_main_highlighter_highlight_string()
 _zsh_highlight_main_highlighter_highlight_dollar_string()
 {
   setopt localoptions noksharrays
+  local -a match mbegin mend
+  local MATCH; integer MBEGIN MEND
   local i j k style
   local AA
   integer c

highlighters/pattern/pattern-highlighter.zsh

@@ -52,6 +52,7 @@ _zsh_highlight_pattern_highlighter_loop()
   # This does *not* do its job syntactically, sorry.
   local buf="$1" pat="$2"
   local -a match mbegin mend
+  local MATCH; integer MBEGIN MEND
   if [[ "$buf" == (#b)(*)(${~pat})* ]]; then
     region_highlight+=("$((mbegin[2] - 1)) $mend[2] $ZSH_HIGHLIGHT_PATTERNS[$pat]")
     "$0" "$match[1]" "$pat"; return $?