Provide a 'mach_print' symbol in libc.

--- a/sysdeps/mach/hurd/i386/libc.abilist	2020-04-01 19:22:44.710088821 +0200
+++ b/sysdeps/mach/hurd/i386/libc.abilist	2020-04-01 19:22:52.062051161 +0200
@@ -338,6 +338,7 @@
 GLIBC_2.2.6 __mach_port_allocate F
 GLIBC_2.2.6 __mach_port_deallocate F
 GLIBC_2.2.6 __mach_port_insert_right F
+GLIBC_2.21 __mach_print F
 GLIBC_2.2.6 __mach_reply_port F
 GLIBC_2.2.6 __mach_task_self_ D 0x4
 GLIBC_2.2.6 __mach_thread_self F

--- a/mach/Versions
+++ b/mach/Versions
@@ -56,6 +56,7 @@
   }
   GLIBC_2.21 {
     __mach_host_self_;
+    mach_print;
   }
 
   HURD_CTHREADS_0.3 {
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<tr><td><span title='2024-09-28 00:20:18 +0200'>2024-09-28</span></td><td><a href='/guix/commit/tests/print.scm?id=b5303183ef865a243f7746a7c19c1a98ad0fa242'>tests: Make ‘tests/print.scm’ deterministic.</a><span class='msg-avail'>...<span class='msg-tooltip'>The “package with inputs” test would fail non-deterministically:
sometimes ‘package-&gt;code’ would pick the ‘glibc’ symbol, sometimes it
would take ‘glibc/hurd’, which is an alias for ‘glibc’.

* tests/print.scm (pkg-with-inputs)[inputs]: Replace ‘glibc’ with
‘gnu-make’.

Change-Id: Ie192adda98d66546fae820a6bcdd5bb4b9f4dae7
</span></span></td><td>Ludovic Courtès</td></tr>