Remove unused macros in .c files

Python/ceval.c

@@ -3804,9 +3804,6 @@ ext_do_call(PyObject *func, PyObject ***pp_stack, int flags, int na, int nk)
 	return result;
 }
 
-#define SLICE_ERROR_MSG \
-	"standard sequence type does not support step size other than one"
-
 /* Extract a slice index from a PyInt or PyLong, and store in *pi.
    Silently reduce values larger than INT_MAX to INT_MAX, and silently
    boost values less than -INT_MAX to 0.  Return 0 on error, 1 on success.

Python/compile.c

@@ -51,9 +51,6 @@ int Py_OptimizeFlag = 0;
 #define DUPLICATE_ARGUMENT \
 "duplicate argument '%s' in function definition"
 
-#define ILLEGAL_DYNAMIC_SCOPE \
-"%.100s: exec or 'import *' makes names ambiguous in nested scope"
-
 #define GLOBAL_AFTER_ASSIGN \
 "name '%.400s' is assigned to before global declaration"
 
@@ -845,8 +842,6 @@ dump(node *n, int pad, int depth)
 		dump(CHILD(n, i), pad + 1, depth);
 }
 
-#define DUMP(N) dump(N, 0, -1)
-
 static int
 com_init(struct compiling *c, const char *filename)
 {