Unimplemented functions defined in headers

[cadaver]

When doing automated script bindings based on Doxygen header file xml output I noticed the following functions are defined but don't have an implementation:

static void float4::Orthogonalize(const float4 &a, float4 &b);
static void float4::Orthogonalize(const float4 &a, float4 &b, float4 &c);
float Plane::Distance(const float4 &point) const;