Attempt to #if around #pragma that are gcc 4.6+ #5299

git-svn-id: https://svn.osgeo.org/gdal/trunk/gdal@26738 f0d54148-0727-0410-94bb-9a71ac55c965
#include <limits> for std::numeric_limits usage #5332

git-svn-id: https://svn.osgeo.org/gdal/trunk/gdal@26739 f0d54148-0727-0410-94bb-9a71ac55c965