remove "NEWDERIV" that's not used

src/binary_c_derivatives.h

@@ -413,19 +413,6 @@
 #define angular_momentum_derivative(STAR,N) (generic_derivative((STAR),N))
 #define specific_angular_momentum_derivative(STAR,N) (generic_derivative((STAR),N))
 
-#ifdef NEWDERIV
-#define mass_derivative(STAR,N) ((STAR)->derivative.mass[(N)])
-#define specific_angular_momentum_derivative(STAR,N) ((STAR)->derivative.specific_angular_momentum[(N)])
-#define angular_momentum_derivative(STAR,N)     \
-    (                                           \
-        ((N==MAGNETIC_BRAKING ? 1.0 :           \
-          N==GRAVITATIONAL_RADIATIVE ? 1.0 :    \
-          N==DERIVATIVE_OR
-mass_derivative((STAR),(N))))*                                    \
-specific_angular_momentum_derivative((STAR),(N))                  \
-)
-#endif
-
 
 #define DERIVATIVE_MODEL 0
 #define DERIVATIVE_STAR0 1