Remove the zsh code that doesn't parse with OSH!

Addresses issue #175.

testdata/completion/git-completion.bash

@@ -2946,91 +2946,6 @@ __gitk_main ()
	__git_complete_revlist
}

if [[ -n ${ZSH_VERSION-} ]] &&
   # Don't define these functions when sourced from 'git-completion.zsh',
   # it has its own implementations.
   [[ -z ${GIT_SOURCING_ZSH_COMPLETION-} ]]; then
	echo "WARNING: this script is deprecated, please see git-completion.zsh" 1>&2

	autoload -U +X compinit && compinit

	__gitcomp ()
	{
		emulate -L zsh

		local cur_="${3-$cur}"

		case "$cur_" in
		--*=)
			;;
		*)
			local c IFS=$' \t\n'
			local -a array
			for c in ${=1}; do
				c="$c${4-}"
				case $c in
				--*=*|*.) ;;
				*) c="$c " ;;
				esac
				array[${#array[@]}+1]="$c"
			done
			compset -P '*[=:]'
			compadd -Q -S '' -p "${2-}" -a -- array && _ret=0
			;;
		esac
	}

	__gitcomp_direct ()
	{
		emulate -L zsh

		local IFS=$'\n'
		compset -P '*[=:]'
		compadd -Q -- ${=1} && _ret=0
	}

	__gitcomp_nl ()
	{
		emulate -L zsh

		local IFS=$'\n'
		compset -P '*[=:]'
		compadd -Q -S "${4- }" -p "${2-}" -- ${=1} && _ret=0
	}

	__gitcomp_file_direct ()
	{
		emulate -L zsh

		local IFS=$'\n'
		compset -P '*[=:]'
		compadd -Q -f -- ${=1} && _ret=0
	}

	__gitcomp_file ()
	{
		emulate -L zsh

		local IFS=$'\n'
		compset -P '*[=:]'
		compadd -Q -p "${2-}" -f -- ${=1} && _ret=0
	}

	_git ()
	{
		local _ret=1 cur cword prev
		cur=${words[CURRENT]}
		prev=${words[CURRENT-1]}
		let cword=CURRENT-1
		emulate ksh -c __${service}_main
		let _ret && _default && _ret=0
		return _ret
	}

	compdef _git git gitk
	return
fi

__git_func_wrap ()
{
	local cur words cword prev