Properly link flecs library

engine/libs/flecs/examples/plecs/strings.flecs

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+// To see what the result of parsing this file looks like, copy the code and
+// paste it into the editor at https://flecs.dev/explorer
+//
+// To load this file yourself, call ecs_plecs_from_file("strings.flecs");
+
+// Plecs component values can be populated with strings. To see how this works,
+// we first need to create a component type (see reflection example).
+using flecs.meta
+
+Struct Shader {
+  filename :- {string}
+  code :- {string}
+}
+
+// Create component values with strings
+my_pipeline {
+  - (Shader, Vertex) {
+    // Normal string
+    filename: "vert.glsl",
+
+    // Multiline string
+    code: `
+      void main() {
+        gl_Position = pos;
+      }`
+    }
+
+  - (Shader, Fragment) {
+    filename: "frag.glsl",
+    code: `
+      void main() {
+        frag_color = color;
+      }`
+    }
+}