Remove the min size limit from system pool for always_malloc

or it will cause huge memory waste

Author: zsx

src/core/m-pools.c

@@ -393,13 +393,17 @@ const REBPOOLSPEC Mem_Pool_Spec[MAX_POOLS] =
 		memset(node, 0, length);
 	} else {
 		if (powerof2) {
-			// !!! WHO added this and why??? Just use a left shift and mask!
-			REBCNT len=2048;
-			while(len<length)
-				len*=2;
-			length=len;
-		} else
-			length = ALIGN(length, 2048);
+				REBCNT len=1;
+				if (!always_malloc) {
+					len = 2048;
+				}
+				// !!! WHO added this and why??? Just use a left shift and mask!
+				while(len<length)
+					len*=2;
+				length=len;
+			} else if (!always_malloc) {
+				length = ALIGN(length, 2048);
+			}
 #ifdef DEBUGGING
 			Debug_Num("Alloc2:", length);
 #endif