DynamicLoader: avoid the min/max macros from windows.h

DynamicLoader.cxx

 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing#kwsys for details.  */
+#if defined(_WIN32)
+#  define NOMINMAX // hide min,max to not conflict with <limits>
+#endif
+
 #include "kwsysPrivate.h"
 #include KWSYS_HEADER(DynamicLoader.hxx)