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='2019-09-25 17:45:39 +0200'>2019-09-25</span></td><td><a href='/guix/commit/gnu/packages/patches/freeimage-unbundle.patch?id=8dc3c2a7d5fbe28b6f8ae27788b053be0d87b0b6'>gnu: freeimage: Update to 3.18.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/image.scm (freeimage): Update to 3.18.0.
[source]: Modify snippet to remove the bundled libjxr. Remove obsolete
patches.
[arguments]: Add libjxr include directory to #:make-flags.
[inputs]: Add libjxr.
* gnu/packages/patches/freeimage-CVE-2015-0852.patch,
gnu/packages/patches/freeimage-CVE-2016-5684.patch,
gnu/packages/patches/freeimage-fix-build-with-gcc-5.patch: Delete files.
* gnu/local.mk (dist_patch_DATA): Unregister patches.
* gnu/packages/patches/freeimage-unbundle.patch: Update patch.

Signed-off-by: Marius Bakke &lt;mbakke@fastmail.com&gt;
</span></span></td><td>Kei Kebrau</td></tr>