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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<tr><td><span title='2017-09-14 00:10:13 +0200'>2017-09-14</span></td><td><a href='/guix/commit/tests/file-systems.scm?id=8f3b63b5d73c0b49139c8a20b7576732abfdeeb8'>uuid: Move tests to 'tests/uuid.scm'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* tests/file-systems.scm ("uuid-&gt;string", "string-&gt;uuid")
("uuid", "uuid, syntax error"): Move to...
* tests/uuid.scm: ... here.  New file.
("uuid, ISO-9660, format preserved"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-09-14 00:10:13 +0200'>2017-09-14</span></td><td><a href='/guix/commit/tests/file-systems.scm?id=2ed1f4a52d8bec2c18a9c92cf4e7caf93aeb40fc'>uuid: Adjust tests.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a followup to 9b336338cdc0e46a3bf7a2913c2f61cd2410c4d6.

* tests/file-systems.scm ("uuid"): Add call to 'uuid-bytevector'.
("uuid, syntax error"): Add 'dce to the expected form.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-03-21 22:33:07 +0100'>2017-03-21</span></td><td><a href='/guix/commit/tests/file-systems.scm?id=278d486b0c0e3ec0378f6a2ccf6946fb176d088b'>file-systems: Do not use (gnu packages …).</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes a regression introduced in
7208995426714c9fc3ad59cadc3cc0f52df0f018 whereby (gnu system
file-systems) would pull in (gnu packages …) module, which in turn
breaks when importing things like (gnu build shepherd).

* gnu/system/file-systems.scm (file-system-type-predicate): Export.
(file-system-packages): Move to...
* gnu/system/linux-initrd.scm (file-system-packages): ... here.  Add
docstring.
* gnu/services/base.scm: Use it.
* tests/file-systems.scm ("does not pull (gnu packages …)"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>