make const (#2348)

* make const

* make const

src/raylib.h

@@ -1426,7 +1426,7 @@ RLAPI void UploadMesh(Mesh *mesh, bool dynamic);
 RLAPI void UpdateMeshBuffer(Mesh mesh, int index, void *data, int dataSize, int offset);    // Update mesh vertex data in GPU for a specific buffer index
 RLAPI void UnloadMesh(Mesh mesh);                                                           // Unload mesh data from CPU and GPU
 RLAPI void DrawMesh(Mesh mesh, Material material, Matrix transform);                        // Draw a 3d mesh with material and transform
-RLAPI void DrawMeshInstanced(Mesh mesh, Material material, Matrix *transforms, int instances); // Draw multiple mesh instances with material and different transforms
+RLAPI void DrawMeshInstanced(Mesh mesh, Material material, const Matrix *transforms, int instances); // Draw multiple mesh instances with material and different transforms
 RLAPI bool ExportMesh(Mesh mesh, const char *fileName);                                     // Export mesh data to file, returns true on success
 RLAPI BoundingBox GetMeshBoundingBox(Mesh mesh);                                            // Compute mesh bounding box limits
 RLAPI void GenMeshTangents(Mesh *mesh);                                                     // Compute mesh tangents

src/rmodels.c

@@ -1404,7 +1404,7 @@ void DrawMesh(Mesh mesh, Material material, Matrix transform)
 }
 
 // Draw multiple mesh instances with material and different transforms
-void DrawMeshInstanced(Mesh mesh, Material material, Matrix *transforms, int instances)
+void DrawMeshInstanced(Mesh mesh, Material material, const Matrix *transforms, int instances)
 {
 #if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
     // Instancing required variables