Force another rebuild

Unfortunately, yesterday Nix got reverted to a version with broken
passAsFile implementation on some Hydra machines, so we have corrupted
files again. (E.g. http://hydra.nixos.org/build/29777678.) Forcing
another gratuitous rebuild to get rid of them.

(cherry picked from commit 75974d9220b8397c736ada76fb24eb934fa62f6c)

pkgs/build-support/trivial-builders.nix

@@ -28,11 +28,13 @@ rec {
       ''
         n=$out${destination}
         mkdir -p "$(dirname "$n")"
+
         if [ -e "$textPath" ]; then
           mv "$textPath" "$n"
         else
           echo -n "$text" > "$n"
         fi
+
         (test -n "$executable" && chmod +x "$n") || true
       '';