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)))
le>
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<div class='path'>path: <a href='/guix/log/?id=cf0e5934d2209490b97500dcdbf2ba2196d50462'>root</a>/<a href='/guix/log/etc?id=cf0e5934d2209490b97500dcdbf2ba2196d50462'>etc</a>/<a href='/guix/log/etc/guix-daemon.service.in?id=cf0e5934d2209490b97500dcdbf2ba2196d50462'>guix-daemon.service.in</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/etc/guix-daemon.service.in?id=cf0e5934d2209490b97500dcdbf2ba2196d50462&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2024-06-26 22:59:55 +0200'>2024-06-26</span></td><td><a href='/guix/commit/etc/guix-daemon.service.in?id=d11b96eb5493231a5a35045505ff8ae8aa746b8e'>etc: Add explicit ‘--substitute-urls’ in guix-daemon service files.</a><span class='msg-avail'>...<span class='msg-tooltip'>Having substitute URLs explicitly listed in the service startup file
makes it clearer what should be modified to permanently change the list
of substitute URLs.

* config-daemon.ac: Rename ‘guix_substitute_urls’ to
‘GUIX_SUBSTITUTE_URLS’ and substitute it.
* nix/local.mk (etc/guix-%.service, etc/init.d/guix-daemon)
(etc/guix-%.conf): Substitute it.
* etc/guix-daemon.conf.in, etc/guix-daemon.service.in,
etc/init.d/guix-daemon.in: Add an explicit ‘--substitute-urls’ option.

Change-Id: Ie491b7fab5c42e54dca582801c03805a85de2bf9
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2024-03-11 14:34:25 -0700'>2024-03-11</span></td><td><a href='/guix/commit/etc/guix-daemon.service.in?id=5f100c68a4a8ef9ed5599bb99c910018869bc6f3'>etc: systemd services: switch to "journal" for output and error logging.</a><span class='msg-avail'>...<span class='msg-tooltip'>The "syslog" method has been deprecated for years, and issues a warning:

  Standard output type syslog is obsolete, automatically updating to
  journal. Please update your unit file, and consider removing the setting
  altogether.

Fixes: #48323

* etc/guix-daemon.service.in (StandardOutput): Use "journal"
(StandardError): Likewise.
* etc/guix-publish.service.in (StandardOutput): Likewise.
(StandardError): Likewise.
</span></span></td><td>Vagrant Cascadian</td></tr>
<tr><td><span title='2022-10-23 02:00:26 +0200'>2022-10-23</span></td><td><a href='/guix/commit/etc/guix-daemon.service.in?id=068f1a1905099f32beec9a8c4904efbb4c503981'>etc: systemd services shouldn't ‘RemainAfterExit’.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/guix-daemon.service.in (RemainAfterExit): Don't.
* etc/guix-publish.service.in (RemainAfterExit): Likewise don't.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2022-10-23 02:00:25 +0200'>2022-10-23</span></td><td><a href='/guix/commit/etc/guix-daemon.service.in?id=0f6ec662f626eb5ff0685a20ca7e153dae7442e6'>etc: Add ‘Restart=always’ to both systemd services.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/guix-daemon.service.in (Restart): ‘Always’ do.
* etc/guix-publish.service.in (Restart): Likewise.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2022-10-23 02:00:00 +0200'>2022-10-23</span></td><td><a href='/guix/commit/etc/guix-daemon.service.in?id=f16d91295a743d43b1604103b1399a621badea8c'>etc: Add ‘OOMPolicy=continue’ to guix-daemon.service.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/guix-daemon.service.in (OOMPolicy): Continue.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>