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

libc/calls/futimens.c

@@ -32,10 +32,10 @@
  * @param fd is file descriptor of file whose timestamps will change
  * @param ts is {access, modified} timestamps, or null for current time
  * @return 0 on success, or -1 w/ errno
- * @raise ENOTSUP if `fd` is on the zip filesystem
  * @raise EINVAL if `flags` had an unrecognized value
  * @raise EPERM if pledge() is in play without `fattr` promise
  * @raise EINVAL if `ts` specifies a nanosecond value that's out of range
+ * @raise EROFS if `fd` is a zip file or on a read-only filesystem
  * @raise EBADF if `fd` isn't an open file descriptor
  * @raise EFAULT if `ts` memory was invalid
  * @raise ENOSYS on RHEL5 or bare metal