msys2: update keyring + update pkgs & autoclean + confirm & prune old/unneeded (place next to msys2_shell.cmd, run from cmd)

pkgsuup.cmd

@echo off
setlocal EnableDelayedExpansion

:pacmgmt
set PKGS=%__CD__%\usr\bin\pacman

:nuukeys
for /f "delims=" %%r in ('%PKGS% -Qu msys2-keyring') do (
  echo + fresskey
  %PKGS% -Suuccy msys2-keyring
)

:suuccyy
echo - querysup
for /f "delims=" %%a in ('%PKGS% -Qu') do (
  echo + syncing..
  %PKGS% -Suuccy
  goto :suuccyy
)
echo = rupdated

:pruneus
for /f "delims=" %%z in ('%PKGS% -Qmq') do (
  echo + prunesit
  echo %PKGS% -Russ %z%
)

:allduun
exit /b 0