Updated msys2 to msys2-base-x86_64-20200903

msys2/usr/share/bash-completion/completions/arch

@@ -10,7 +10,7 @@ _arch()
 
     case $prev in
         -w|-g|-d|--welcome-msg|--goodbye-msg|--digest)
-            COMPREPLY=( $( compgen -W 'y n' -- "$cur" ) )
+            COMPREPLY=( $(compgen -W 'y n' -- "$cur") )
             return
             ;;
         -d|--file)
@@ -22,12 +22,12 @@ _arch()
     $split && return
 
     if [[ "$cur" == -* ]]; then
-        COMPREPLY=( $( compgen -W '$( _parse_help "$1" )' -- "$cur" ) )
+        COMPREPLY=( $(compgen -W '$(_parse_help "$1")' -- "$cur") )
     else
         local args=$cword
         for (( i=1; i < cword; i++ )); do
             if [[ "${words[i]}" == -* ]]; then
-                args=$(($args-1))
+                (( args-- ))
             fi
         done
         case $args in