tdf#89236: Don't deflate encrypted document in parallel

I see "warn:legacy.osl:22439:1:package/source/zipapi/ZipFile.cxx:583:
Can't detect password correctness without digest!"
when opening file saved with password.

Obviously css::xml::crypto::XDigestContext used in ZipOutputEntry does not
work properly when encrypting files in parallel, so don't do that.

Change-Id: I4b354535240a4f31a6bc6855cf7f9af527634e7e
Reviewed-on: https://gerrit.libreoffice.org/21238Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Matúš Kukan <matus@libreoffice.org>

package/source/zippackage/ZipPackageStream.cxx

@@ -816,7 +816,8 @@ bool ZipPackageStream::saveChild(
             }
             else
             {
-                bParallelDeflate = true;
+                // tdf#89236 Encrypting in parallel does not work
+                bParallelDeflate = !bToBeEncrypted;
                 // Do not deflate small streams in a thread
                 if (xSeek.is() && xSeek->getLength() < 100000)
                     bParallelDeflate = false;