Fix error in SMTChecker: Use rich indentifier instead of external identifier to ecnode member access to functions

test/libsolidity/smtCheckerTests/functions/functions_library_internal.sol

@@ -0,0 +1,14 @@
+library L {
+	function value(function()internal a, uint256 b) internal {}
+}
+contract C {
+	using L for function()internal;
+
+	function f() public {
+		function()internal x;
+		x.value(42);
+ 	}
+}
+// ====
+// SMTEngine: all
+// ----