Optimize memory layout

Compared to b69f3d2488, old windows specific fd, zipos and nsync memory ranges in libc/runtime/memtrack.internal.h were kept.

test/libc/intrin/kprintf_test.c

@@ -49,6 +49,10 @@ static uint64_t Rando(void) {
   return x;
 }
 
+void SetUp(void) {
+  __print_maps();
+}
+
 static const struct {
   const char *want;
   const char *fmt;