Fix small matters and improve sysconf()

- Fix mkdeps.com out of memory error
- Remove static memory from __get_cpu_count()
- Add support for passing hyphen to cat in cocmd
- Change more ZipOS errors from ENOTSUP to EROFS
- Specify mem_unit in sysinfo() output on BSD OSes

net/turfwar/turfwar.c

@@ -1916,7 +1916,7 @@ int main(int argc, char *argv[]) {
   // we don't have proper futexes on these platforms
   // we'll be somewhat less aggressive about workers
   if (IsXnu() || IsNetbsd()) {
-    g_workers = MIN(g_workers, _getcpucount());
+    g_workers = MIN(g_workers, (unsigned)__get_cpu_count());
   }
 
   // user interface