Make mtime omni-parsable

libmtime sometimes used modules with the following syntax:
use :: module_name
unfortunately, the omni-compiler (on which CLAW relies) was unable to parse this. This merge request therefore changes all
use :: module_name to use module_name

src/int_div.c

@@ -27,7 +27,7 @@ void number_init(t_number *x, const t_int val, const unsigned int m) {
 /* linear search to determine the length of a natural number. */
 unsigned int length(const t_number x) {
   int i = W_DIGITS;
-  while ((x[i] == iZero) && (i >= 0))  i--;
+  while ((i >= 0) && (x[i] == iZero))  i--;
   return (i+1);
 }