xrGame: fix linux linkage of le_function

Author: eagleivg

src/xrGame/state_arguments_functions.h

@@ -55,6 +55,11 @@ class functions_cf
     static ge_function<T> ge_function;
     static le_function<T> le_function;
 };
+// definitions of static members of functions_cf
+template<typename T>
+ge_function<T> functions_cf<T>::ge_function;
+template<typename T>
+le_function<T> functions_cf<T>::le_function;
 
 typedef binary_function<float> float_binary_function;
 typedef functions_cf<float> float_bfunc_cf;