[fix/292_unused_functions] Mark rotate_z and accurate_square_root as unused. Last part of the issues in #292.

Author: chief1983

code/math/fvi.cpp

@@ -18,7 +18,7 @@
 #define	UNINITIALIZED_VALUE	-1234567.8f
 #define WARN_DIST	1.0
 
-static void accurate_square_root( float A, float B, float C, float discriminant, float *root1, float *root2 );
+static void accurate_square_root( float A, float B, float C, float discriminant, float *root1, float *root2 ) __UNUSED;
 
 static float matrix_determinant_from_vectors(const vec3d *v1, const vec3d *v2, const vec3d *v3)
 {

code/math/vecmat.cpp

@@ -29,6 +29,8 @@ matrix vmd_identity_matrix = IDENTITY_MATRIX;
 
 #define	UNINITIALIZED_VALUE	-12345678.9f
 
+static void rotate_z ( matrix *m, float theta ) __UNUSED;
+
 bool vm_vec_equal(const vec4 &self, const vec4 &other)
 {
 	return fl_equal(self.a1d[0], other.a1d[0]) && fl_equal(self.a1d[1], other.a1d[1]) && fl_equal(self.a1d[2], other.a1d[2]) && fl_equal(self.a1d[3], other.a1d[3]);