Replace div_up() and round_up() functions with macros.

src/util.c

@@ -25,16 +25,6 @@
 #define __USE_GNU
 #include <unistd.h>
 
-inline int div_up(unsigned int n, unsigned int div)
-{
-    return (n + div - 1) / div;
-}
-
-inline int round_up(unsigned int n, unsigned int mul)
-{
-    return div_up(n, mul) * mul;
-}
-
 int int_pow(int base, int power)
 {
     int result = 1;