Enable export only for windows

contrib/pugixml/src/pugiconfig.hpp

@@ -30,8 +30,10 @@
 // #define PUGIXML_NO_EXCEPTIONS
 
 // Set this to control attributes for public classes/functions, i.e.:
+#ifdef _WIN32
 #define PUGIXML_API __declspec(dllexport) // to export all public symbols from DLL
 #define PUGIXML_CLASS __declspec(dllimport) // to import all classes from DLL
+#endif
 // #define PUGIXML_FUNCTION __fastcall // to set calling conventions to all public functions to fastcall
 // In absence of PUGIXML_CLASS/PUGIXML_FUNCTION definitions PUGIXML_API is used instead