Don't update msys2 on installation

Fixes #1268

Author: hasufell

scripts/bootstrap/bootstrap-haskell.ps1

@@ -561,12 +561,6 @@ if ($msys2Action -eq 0) {
 
     Exec "$env:windir\system32\taskkill.exe" /F /FI "MODULES eq msys-2.0.dll"
 
-    Print-Msg -msg 'Upgrading full system...'
-    Exec "$Bash" '-lc' 'pacman --noconfirm -Syuu'
-
-    Print-Msg -msg 'Upgrading full system twice...'
-    Exec "$Bash" '-lc' 'pacman --noconfirm -Syuu'
-
     Print-Msg -msg 'Installing Dependencies...'
     Exec "$Bash" '-lc' ('pacman --noconfirm -S --needed curl autoconf {0}' -f $PkgConf)