Temporarily hold back from upgrading git-extra

This is needed to help the deployment of
git-for-windows/build-extra#619.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

etc/pacman.conf

@@ -21,7 +21,7 @@ HoldPkg     = pacman
 Architecture = auto
 
 # Pacman won't upgrade packages listed in IgnorePkg and members of IgnoreGroup
-# IgnorePkg   =
+IgnorePkg   = mingw-w64-x86_64-git-extra
 #IgnoreGroup =
 
 #NoUpgrade   =