Don't re-sign vc_redist packages

Change-Id: I62f55463c04f9bab1dd37f80fe6e15e0296d10bf
Reviewed-on: https://gerrit.libreoffice.org/49388Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

postprocess/signing/no_signing.txt

@@ -8,3 +8,5 @@ policy.1.0.cli_oootypes.dll
 policy.1.0.cli_ure.dll
 policy.1.0.cli_cppuhelper.dll
 policy.1.0.cli_basetypes.dll
+vc_redist.x64.exe
+vc_redist.x86.exe