Make configure assume nvi can store backups in /var/tmp.

--- a/dist/configure	2014-09-01 14:46:01.075778095 +0200
+++ b/dist/configure	2014-09-01 14:52:08.411790122 +0200
@@ -21319,23 +21319,8 @@
 if test "${vi_cv_path_preserve+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
 else
-  	dirlist="/var/preserve /var/tmp /usr/tmp"
-	vi_cv_path_preserve=no
-	for i in $dirlist; do
-		if test -d $i/vi.recover; then
-			vi_cv_path_preserve=$i/vi.recover
-			break;
-		fi
-	done
-	if test "$vi_cv_path_preserve" = no; then
-		for i in $dirlist; do
-			if test -d $i -a -w $i; then
-				vi_cv_path_preserve=$i/vi.recover
-				break;
-			fi
-		done
-
-	fi
+#	Assume /var/tmp
+	vi_cv_path_preserve=/var/tmp/vi.recover
 fi
 
 if test "$vi_cv_path_preserve" = no; then
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<div class='path'>path: <a href='/guix/log/?id=1ae2c577a6c79ac2914e268ffca89459b196dcb2'>root</a>/<a href='/guix/log/nix?id=1ae2c577a6c79ac2914e268ffca89459b196dcb2'>nix</a>/<a href='/guix/log/nix/libstore?id=1ae2c577a6c79ac2914e268ffca89459b196dcb2'>libstore</a>/<a href='/guix/log/nix/libstore/misc.cc?id=1ae2c577a6c79ac2914e268ffca89459b196dcb2'>misc.cc</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/nix/libstore/misc.cc?id=1ae2c577a6c79ac2914e268ffca89459b196dcb2&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-03-30 23:42:07 +0200'>2018-03-30</span></td><td><a href='/guix/commit/nix/libstore/misc.cc?id=c7589cce8d3f9fcb7769e424f341dba8fb3545d0'>daemon: Remove dead code.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-07-03 00:30:55 +0200'>2015-07-03</span></td><td><a href='/guix/commit/nix/libstore/misc.cc?id=322eeb87d0e5bb608ae1c176611a50297c93cbe8'>Merge branch 'nix'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-01-04 23:27:34 +0100'>2015-01-04</span></td><td><a href='/guix/commit/nix/libstore/misc.cc?id=15ddeff532b517843668eef8f615838d15b4f75c'>Merge commit a1dd396cc02922372314c35c8035a38bfeea08df of branch 'nix'.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2014-12-19 22:47:37 +0100'>2014-12-19</span></td><td><a href='/guix/commit/nix/libstore/misc.cc?id=36457566f9917dc7c0c348d012816a2ca333ef1b'>Merge branch 'nix' into 'master'.</a></td><td>Ludovic Courtès</td></tr>
1-02-04 09:23:39 +0100'>2021-02-04</span></td><td><a href='/guix/commit/m4?id=55daad123e896c0e83361496cf49625289ee3571'>build: Add '--with-channel-commit' and related configure flags.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-12-11 19:06:53 +0100'>2020-12-11</span></td><td><a href='/guix/commit/m4?id=dbdae9f96f11a006993b659e0e7fd5cbf467f844'>maint: Avoid macros obsolete in Autoconf 2.70.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-10-22 17:10:25 +0200'>2020-10-22</span></td><td><a href='/guix/commit/m4?id=59bb1ae3a9aeae75a75b20090253613a7a8800d8'>git: Require Guile-Git 0.3.0 or later.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-09-08 00:47:35 +0200'>2020-09-08</span></td><td><a href='/guix/commit/m4?id=b5eb901ab508e13a10d8c11fe0c9d0d06dddce96'>Remove (guix json) and require Guile-JSON 4.3.0+.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-08-29 16:24:17 +0200'>2020-08-29</span></td><td><a href='/guix/commit/m4?id=f5d3a1690cb78ce9413b78352f1030bf4801617a'>build: Remove check for Guile 2.2.1 bug.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-08-24 13:35:24 +0200'>2020-08-24</span></td><td><a href='/guix/commit/m4?id=4c0c65acfade63ce0549115d19db4b639c1e9992'>Use "guile-zlib" and "guile-lzlib" instead of (guix config).</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>