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='2023-01-15 01:00:19 +0100'>2023-01-15</span></td><td><a href='/guix/commit/gnu/packages/lirc.scm?id=4e4ea85c260a3f668b1ba46be4fc6a6d06aa093c'>gnu: lirc: Remove obsolete trailing #t.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/lirc.scm (lirc)[arguments]:
Don't explicitly return #t from phases.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2023-01-15 01:00:00 +0100'>2023-01-15</span></td><td><a href='/guix/commit/gnu/packages/lirc.scm?id=ec3226c3985d5ec168d45499f12dfcf87f0f5c94'>gnu: lirc: Update to 0.10.2.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/lirc.scm (lirc): Update to 0.10.2.
[arguments]: Add a new 'build-reproducibly phase to partially replace…
* gnu/packages/patches/lirc-reproducible-build.patch: …this updated file.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2023-01-15 01:00:00 +0100'>2023-01-15</span></td><td><a href='/guix/commit/gnu/packages/lirc.scm?id=ea37595a7c71a430b0d1a2c860b9b0e37ec126bd'>gnu: lirc: Build reproducibly.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/lirc.scm (lirc)[arguments]: Add a new 'omit-pip-sourceball phase.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2022-05-31 14:54:09 -0400'>2022-05-31</span></td><td><a href='/guix/commit/gnu/packages/lirc.scm?id=0b478a5d701f4794e46794967055d9e11c8bdfb2'>gnu: Remove python2-lirc.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/lirc.scm (python2-lirc): Delete variable.
(python-lirc)[properties]: Delete field.
</span></span></td><td>Maxim Cournoyer</td></tr>