#i125143# reduce helpex stack usage to prevent intermittent failures

moving the 1MB copy buffer from the stack to the heap solves the problem
that was first observed on the Windows buildbot.

l10ntools/source/export2.cxx

@@ -36,6 +36,7 @@
 #include <tools/urlobj.hxx>
 #include <time.h>
 #include <stdlib.h>
+#include <boost/shared_ptr.hpp>
 
 using namespace std;
 //
@@ -339,9 +340,6 @@ void Export::RemoveUTF8ByteOrderMarkerFromFile( const ByteString &rFilename ){
 bool Export::CopyFile( const ByteString& source , const ByteString& dest )
 {
 //    cout << "CopyFile( " << source.GetBuffer() << " , " << dest.GetBuffer() << " )\n";
-    static const int BUFFERSIZE = 0x100000;
-    char buf[ BUFFERSIZE ];
-
     FILE* IN_FILE = fopen( source.GetBuffer() , "r" );
     if( IN_FILE == NULL )
     {
@@ -357,6 +355,10 @@ bool Export::CopyFile( const ByteString& source , const ByteString& dest )
         return false;
     }
 
+    static const int BUFFERSIZE = 0x100000;
+    boost::shared_ptr<char> aScopedBuffer( new char[BUFFERSIZE] );
+    char* buf = aScopedBuffer.get();
+
     bool bOk = true;
     while( bOk )
     {