Missing include

Change-Id: I020424db94a6fbdba22ff887b912d3f7bb459502
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/116709
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
diff --git a/svx/source/unodraw/SvxXTextColumns.cxx b/svx/source/unodraw/SvxXTextColumns.cxx
index d245f07..2ddaebc 100644
--- a/svx/source/unodraw/SvxXTextColumns.cxx
+++ b/svx/source/unodraw/SvxXTextColumns.cxx
@@ -38,6 +38,8 @@
#include <tools/UnitConversion.hxx>
#include <vcl/svapp.hxx>

#include <numeric>

namespace
{
enum : sal_uInt16