public: add dll helpers to simplify basic interaction with exported functions lists

common/xash3d_types.h

@@ -232,6 +232,7 @@ typedef struct dll_info_s
 {
 	const char	*name;	// name of library
 	const dllfunc_t	*fcts;	// list of dll exports
+	const size_t num_fcts;
 	qboolean		crash;	// crash if dll not found
 	void		*link;	// hinstance of loading library
 } dll_info_t;