Fix doc snarfing with GCC 4.5+.
From <http://git.savannah.gnu.org/cgit/guile.git/commit/?h=branch_release-1-8&id=aac41d28358cea594bb30f6e547afb82bb6004a6>.

diff --git a/scripts/snarf-check-and-output-texi b/scripts/snarf-check-and-output-texi
index ea33e17..8cd42e8 100755
--- a/scripts/snarf-check-and-output-texi
+++ b/scripts/snarf-check-and-output-texi
@@ -267,6 +267,17 @@ exec ${GUILE-guile} -l $0 -c "(apply $main (cdr (command-line)))" "$@"
       (set! *file* file)
       (set! *line* line))
 
+     ;; newer gccs like to throw around more location markers into the
+     ;; preprocessed source; these (hash . hash) bits are what they translate to
+     ;; in snarfy terms.
+     (('location ('string . file) ('int . line) ('hash . 'hash))
+      (set! *file* file)
+      (set! *line* line))
+
+     (('location ('hash . 'hash) ('string . file) ('int . line) ('hash . 'hash))
+      (set! *file* file)
+      (set! *line* line))
+
      (('arglist rest ...)
       (set! *args* (do-arglist rest)))
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<div class='path'>path: <a href='/guix/log/?id=f59c31deaf44cf487878ae6e6b61026630b616ff'>root</a>/<a href='/guix/log/gnu?id=f59c31deaf44cf487878ae6e6b61026630b616ff'>gnu</a>/<a href='/guix/log/gnu/packages?id=f59c31deaf44cf487878ae6e6b61026630b616ff'>packages</a>/<a href='/guix/log/gnu/packages/patches?id=f59c31deaf44cf487878ae6e6b61026630b616ff'>patches</a>/<a href='/guix/log/gnu/packages/patches/gnupg-1-build-with-gcc10.patch?id=f59c31deaf44cf487878ae6e6b61026630b616ff'>gnupg-1-build-with-gcc10.patch</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/gnu/packages/patches/gnupg-1-build-with-gcc10.patch?id=f59c31deaf44cf487878ae6e6b61026630b616ff&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-08-08 13:51:11 +0300'>2021-08-08</span></td><td><a href='/guix/commit/gnu/packages/patches/gnupg-1-build-with-gcc10.patch?id=086183598e347812fa4d05e3661914a569fb0e29'>gnu: gnupg-1: Fix build with gcc-10.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/gnupg.scm (gnupg-1)[source]: Add patch.
* gnu/packages/patches/gnupg-1-build-with-gcc10.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.
</span></span></td><td>Efraim Flashner</td></tr>

* gnu/tests/databases.scm (%memcached-os): Likewise.
(%mongodb-os): Likewise.
* gnu/tests/dict.scm (%dicod-os): Likewise.
* gnu/tests/mail.scm (%opensmtpd-os): Likewise.
(%exim-os): Likewise.
(%dovecot-os): Likewise.
* gnu/tests/messaging.scm (run-xmpp-test): Likewise.
(run-bitlbee-test): Likewise.
* gnu/tests/monitoring.scm (%prometheus-node-exporter-os): Likewise.
* gnu/tests/networking.scm (%inetd-os): Likewise.
(run-iptables-test): Likewise.
* gnu/tests/nfs.scm (%base-os): Likewise.
* gnu/tests/rsync.scm (%rsync-os): Likewise.
* gnu/tests/ssh.scm (run-ssh-test): Likewise.
* gnu/tests/version-control.scm (%cgit-os): Likewise.
(%git-http-os): Likewise.
(%gitolite-os): Likewise.
* gnu/tests/virtualization.scm (%libvirt-os): Likewise.
* gnu/tests/web.scm (%httpd-os): Likewise.
(%nginx-os): Likewise.
(%varnish-os): Likewise.
(%php-fpm-os): Likewise.
(%hpcguix-web-os): Likewise.
(%tailon-os): Likewise.
* tests/guix-system.sh: Likewise.
* doc/guix.texi (Networking Services): Document
'dhcp-client-service-type' and remove 'dhcp-client-service'.


</td></tr>
<tr class='logheader'><td><span title='2017-08-23 12:48:11 +0100'>2017-08-23</span></td><td class='logsubject'><a href='/guix/commit/gnu/tests/virtualization.scm?id=c075c8fd0c79293a1461f78c7f7b141af23fa7bf'>tests: Add 'libvirt-service-type' test.</a></td><td>Christopher Baines</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/tests/virtualization.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.


</td></tr>