Minimally patch libtheora's ancient config.guess to support mips64.

--- libtheora/config.guess.orig	2009-02-23 22:50:50.000000000 -0500
+++ libtheora/config.guess	2013-10-31 23:49:48.155999944 -0400
@@ -798,25 +798,24 @@
     m68*:Linux:*:*)
 	echo ${UNAME_MACHINE}-unknown-linux-gnu
 	exit 0 ;;
-    mips:Linux:*:*)
+    mips:Linux:*:* | mips64:Linux:*:*)
 	eval $set_cc_for_build
 	sed 's/^	//' << EOF >$dummy.c
 	#undef CPU
-	#undef mips
-	#undef mipsel
+	#undef ${UNAME_MACHINE}
+	#undef ${UNAME_MACHINE}el
 	#if defined(__MIPSEL__) || defined(__MIPSEL) || defined(_MIPSEL) || defined(MIPSEL)
-	CPU=mipsel
+	CPU=${UNAME_MACHINE}el
 	#else
 	#if defined(__MIPSEB__) || defined(__MIPSEB) || defined(_MIPSEB) || defined(MIPSEB)
-	CPU=mips
+	CPU=${UNAME_MACHINE}
 	#else
 	CPU=
 	#endif
 	#endif
 EOF
-	eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep ^CPU=`
-	rm -f $dummy.c && rmdir $tmpdir
-	test x"${CPU}" != x && echo "${CPU}-pc-linux-gnu" && exit 0
+	eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep '^CPU'`
+	test x"${CPU}" != x && { echo "${CPU}-unknown-linux-gnu"; exit 0; }
 	;;
     ppc:Linux:*:*)
 	echo powerpc-unknown-linux-gnu
'>refs</a><a class='active' href='/guix/log/tests/guix-refresh.sh'>log</a><a href='/guix/tree/tests/guix-refresh.sh?id=d9d920403ade33803a8a7041a8e0ee179a4a1a5d'>tree</a><a href='/guix/commit/tests/guix-refresh.sh?id=d9d920403ade33803a8a7041a8e0ee179a4a1a5d'>commit</a><a href='/guix/diff/tests/guix-refresh.sh?id=d9d920403ade33803a8a7041a8e0ee179a4a1a5d'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/tests/guix-refresh.sh'>
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<div class='path'>path: <a href='/guix/log/?id=d9d920403ade33803a8a7041a8e0ee179a4a1a5d'>root</a>/<a href='/guix/log/tests?id=d9d920403ade33803a8a7041a8e0ee179a4a1a5d'>tests</a>/<a href='/guix/log/tests/guix-refresh.sh?id=d9d920403ade33803a8a7041a8e0ee179a4a1a5d'>guix-refresh.sh</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/guix-refresh.sh?id=d9d920403ade33803a8a7041a8e0ee179a4a1a5d&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-04-21 17:09:46 +0200'>2023-04-21</span></td><td><a href='/guix/commit/tests/guix-refresh.sh?id=61a6b05850f99dcff65c83585c97604466d4ecf3'>tests: Relax two tests that expected a non-zero error code.</a><span class='msg-avail'>...<span class='msg-tooltip'>* tests/guix-package-aliases.sh: "guix upgrade foo bar" has always
returned zero; adjust accordingly.
* tests/guix-refresh.sh: "guix refresh -t test idutils" and similar
return zero; adjust accordingly.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-04-21 16:16:38 +0200'>2023-04-21</span></td><td><a href='/guix/commit/tests/guix-refresh.sh?id=37dd69b44511dc73eb04bdebe8d82c9a0386338e'>tests: Fix checks for expected failures.</a><span class='msg-avail'>...<span class='msg-tooltip'>Addresses &lt;https://issues.guix.gnu.org/62406&gt;.

With 'set -e', a return status inverted with '!' does not cause the shell to
exit immediately.  Instead use '&amp;&amp; false' to indicate an expected failure.

* tests/guix-archive.sh, tests/guix-build-branch.sh, tests/guix-build.sh,
tests/guix-daemon.sh, tests/guix-download.sh,
tests/guix-environment-container.sh, tests/guix-environment.sh,
tests/guix-gc.sh, tests/guix-git-authenticate.sh, tests/guix-graph.sh,
tests/guix-hash.sh, tests/guix-home.sh, tests/guix-pack-relocatable.sh,
tests/guix-pack.sh, tests/guix-package-aliases.sh, tests/guix-package-net.sh,
tests/guix-package.sh, tests/guix-refresh.sh, tests/guix-shell.sh,
tests/guix-style.sh, tests/guix-system.sh: Replace uses of '! ...' with
'... &amp;&amp; false' or `test ! ...` as appropriate.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Eric Bavier</td></tr>
<tr><td><span title='2023-01-25 22:53:20 +0100'>2023-01-25</span></td><td><a href='/guix/commit/tests/guix-refresh.sh?id=ebcb5c8e120b39a3dd07c27bc17d520ee653ec23'>tests: Do not try to create "$HOME/.config".</a><span class='msg-avail'>...<span class='msg-tooltip'>Previously this test would fail when HOME=/homeless-shelter and said
directory cannot be created.

* tests/guix-refresh.sh: Pass '--keyring' together with '-u'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-01-08 16:11:45 +0100'>2023-01-08</span></td><td><a href='/guix/commit/tests/guix-refresh.sh?id=04f247be81dcb5296ecab776f735bb615a1039d3'>refresh: Add CLI tests.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/import/test.scm, tests/guix-refresh.sh: New files.
* Makefile.am (MODULES, SH_TESTS): Add them.
</span></span></td><td>Ludovic Courtès</td></tr>