glibc build for Hurd broken

[Joseph Myers]

The glibc build for Hurd has recently become broken.  I see errors:

get-host.c: In function '_hurd_get_host_config':
get-host.c:57:34: error: passing argument 2 of '__io_readable' from incompatible pointer type [-Werror=incompatible-pointer-types]
   57 |     err = __io_readable (config, &more);
      |                                  ^~~~~
      |                                  |
      |                                  mach_msg_type_number_t * {aka unsigned int *}
In file included from ../hurd/hurd.h:36,
                 from ../sysdeps/hurd/include/hurd.h:2,
                 from get-host.c:20:
/scratch/jmyers/glibc/many9/build/compilers/i686-gnu/glibc/i686-gnu/hurd/hurd/io.h:75:13: note: expected 'vm_size_t *' {aka 'long unsigned int *'} but argument is of type 'mach_msg_type_number_t *' {aka 'unsigned int *'}
   75 |  vm_size_t *amount
      |  ~~~~~~~~~~~^~~~~~
cc1: all warnings being treated as errors

I suspect the commit breaking things is gnumach commit 
1e90662dd80c64de27b432c9d6911fad937da804, "64bit: Fix vm_size_t size".

-- 
Joseph S. Myers
joseph@codesourcery.com