unset POSIXLY_CORRECT for bash

[step-]

If POSIXLY_CORRECT is set in the bash process environment running z somePath produces:

sh: command substitution: line 168: syntax error near unexpected token `<'
sh: command substitution: line 168: ` < <( _z_dirs ) awk -v t="$(date +%s)" -v list="$list" -v typ="$typ" -v q="$fnd" -F"|" ''