Replace undefined SIZEOF_LONG with sizeof(long)

Index: maa/bit.c
--- maa/bit.c.orig
+++ maa/bit.c
@@ -59,24 +59,21 @@ int bit_cnt(unsigned long *flags)
 {
 	unsigned long x = *flags;
 
-#if SIZEOF_LONG == 4
+    if (sizeof(long) == 4) {
 	x = (x >> 1  & 0x55555555) + (x & 0x55555555);
 	x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
 	x = ((x >> 4) + x) & 0x0f0f0f0f;
 	x = ((x >> 8) + x);
 	return (x + (x >> 16)) & 0xff;
-#else
-#if SIZEOF_LONG == 8
+    } else if(sizeof(long) == 8) {
 	x = (x >> 1  & 0x5555555555555555) + (x & 0x5555555555555555);
 	x = ((x >> 2) & 0x3333333333333333) + (x & 0x3333333333333333);
 	x = ((x >> 4) + x) & 0x0f0f0f0f0f0f0f0f;
 	x = ((x >> 8) + x) & 0x00ff00ff00ff00ff;
 	x = ((x >> 16) + x) & 0x0000ffff0000ffff;
 	return (x + (x >> 32)) & 0xff;
-#else
+    } else
 	err_internal(__func__,
 				 "Implemented for 32-bit and 64-bit longs, not %d-bit longs",
-				 SIZEOF_LONG * 8);
-#endif
-#endif
+				 sizeof(long) * 8);
 }
