Globally disable threading for these for now.

It doesn't win us much performance-wise (as it turned out), and causes
weird crashers with large documents.

Change-Id: I0566ce850b8f6656e6f9821c653b7a825a7874a3
(cherry picked from commit e0425f94)

package/source/zippackage/ZipPackageStream.cxx

@@ -810,6 +810,8 @@ bool ZipPackageStream::saveChild(
                 if (xSeek.is() && xSeek->getLength() < 100000)
                     bParallelDeflate = false;
 
+                bParallelDeflate = false; // globally disable parallel deflate for now.
+
                 if (bParallelDeflate)
                 {
                     // Start a new thread deflating this zip entry

sc/source/filter/excel/xetable.cxx

@@ -2069,6 +2069,7 @@ void XclExpRowBuffer::Finalize( XclExpDefaultRowData& rDefRowData, const ScfUInt
     // on its own data.
     size_t nRows = maRowMap.size();
     size_t nThreads = std::max( std::thread::hardware_concurrency(), 1U );
+    nThreads = 1; // globally disable multi-threading for now.
     if ( nThreads == 1 || nRows < 128 )
     {
         RowMap::iterator itr, itrBeg = maRowMap.begin(), itrEnd = maRowMap.end();