convert ksh functions to POSIX syntax

src/_cask

@@ -40,7 +40,7 @@
 #
 # ------------------------------------------------------------------------------
 
-function _cask() {
+_cask() {
   local ret=1 state
   _arguments \
     ':subcommand:->subcommand' \

src/_virsh

@@ -38,7 +38,7 @@
 
 local -a args reply
 
-function _virsh-domains() {
+_virsh-domains() {
   local -a out
   out=( ${${${${(f)"$(virsh list "$@")"}:#(---| Id)*}## #[0-9-]## ##}%% *} )
   _describe -t domains "${${1#--}:-running} domains" out