Properly link flecs library

engine/libs/flecs/examples/cpp/reflection/runtime_component/src/main.cpp

@@ -0,0 +1,25 @@
+#include <runtime_component.h>
+#include <iostream>
+
+int main(int, char *[]) {
+    flecs::world ecs;
+
+    // Create component for a type that isn't known at compile time
+    flecs::entity position = ecs.component("Position")
+        .member<float>("x")
+        .member<float>("y");
+
+    // Create entity, set value of position using reflection API
+    flecs::entity e = ecs.entity();
+    void *ptr = e.get_mut(position);
+
+    flecs::cursor cur = ecs.cursor(position, ptr);
+    cur.push();
+    cur.set_float(10);
+    cur.next();
+    cur.set_float(20);
+    cur.pop();
+
+    // Convert component to string
+    std::cout << ecs.to_expr(position, ptr).c_str() << "\n"; // {x: 10, y: 20}
+}