Fixed incorrect const values

lib/mem/alloc_windows.q

@@ -1,7 +1,9 @@
-import sys
+extern kernel32 {
+	VirtualAlloc(address int, size uint, flags uint32, protection uint32) -> *any
+}
 
 alloc(length int) -> []byte {
-	x := sys.mmap(0, length+8, page.readwrite, mem.commit|mem.reserve)
+	x := kernel32.VirtualAlloc(0, length+8, mem.commit|mem.reserve, page.readwrite)
 
 	if x < 0x1000 {
 		return x
@@ -9,13 +11,4 @@ alloc(length int) -> []byte {
 
 	store(x, 8, length)
 	return x + 8
-}
-
-const page {
-	readwrite 0x0004
-}
-
-const mem {
-	commit  0x1000
-	reserve 0x2000
 }