Add missing const

[Maneren]

Hi, I believe there is supposed to be a const here to match the C version.

RLAPI void DrawLineStrip(const Vector2 *points, int pointCount, Color color);

https://github.com/raysan5/raylib/blob/master/src%2Fraylib.h#L1242

[Maneren]

Sorry, I‌ just noticed this library officially supports only raylib 5.0, but the upstream const was added in a newer version.

[RobLoach]

Thanks! There is the next branch for 5+ raylib https://github.com/RobLoach/raylib-cpp/tree/next

Feel free to submit any changes there 😉

[RobLoach]

#316