Vector2/Vector3: Add squared distance.

[AnilBK]

Needed to sort polygons with distance to camera. In such cases, where we just do comparisons, squared distance seems good.
Might be useful as a general API.

Not sure if this is considered bloat, but as we can see vector2/3 has length and squared length functions.

raylib/src/raymath.h

Lines 249 to 263 in 43dbe67

	// Calculate vector length
	RMAPI float Vector2Length(Vector2 v)
	{
	float result = sqrtf((v.x*v.x) + (v.y*v.y));
	return result;
	}
	// Calculate vector square length
	RMAPI float Vector2LengthSqr(Vector2 v)
	{
	float result = (v.x*v.x) + (v.y*v.y);
	return result;
	}

[raysan5]

@AnilBK I consider it a bit bloat but I'm adding it...

[AnilBK]

Thanks. <3
Will surely contribute to no bloat stuffs, if I can :D