pacman-helper: allow for new packages to be added

The `git rm` call assumes that there have been previous versions of the
same package that now need to be deleted. Let's not do that, as it would
prevent e.g. `mingw-w64-llvm-tools` from being deployed (see
git-for-windows/MINGW-packages#149 for details).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

pacman-helper.sh

@@ -444,7 +444,7 @@ quick_action () { # <action> <file>...
 		 # `:(exclude)<pkgname>-[0-9]*-*-*-*`
 		 s/$/-*-*-*/
 		 s/^/:(exclude)/' |
-		 xargs git rm --sparse --cached -- ||
+		 xargs git rm --sparse --cached --ignore-unmatch -- ||
 		 die "Could not remove the existing versions from the Git branch in $arch"
 
 		 # Now add the files to the Git branch