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='2018-09-14 21:31:24 +0200'>2018-09-14</span></td><td><a href='/guix/commit/gnu/bootloader?id=e830c9d0b0ff7622b8bb86348ee0c97a28e2f2d8'>gnu: Rename "banana-pi" to "bananapi".</a><span class='msg-avail'>...</span></td><td>Danny Milosavljevic</td></tr>
<tr><td><span title='2018-06-26 17:27:40 +0200'>2018-06-26</span></td><td><a href='/guix/commit/gnu/bootloader?id=683016907d5eb5b9b526d21e36de28c16ff6e5cc'>bootloader: grub-efi: Identify as "GuixSD" instead of "grub".</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2018-06-26 17:27:40 +0200'>2018-06-26</span></td><td><a href='/guix/commit/gnu/bootloader?id=aa5a549c65485ff826267a48795c1564af17f1c9'>bootloader: grub-efi: Support EFI directories relative to MOUNT-POINT.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2018-06-01 15:21:28 +0200'>2018-06-01</span></td><td><a href='/guix/commit/gnu/bootloader?id=33d8a871042e73d6b236793d02e5a8287a47ebe4'>bootloader: grub: Use 'with-extensions'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-06-01 15:21:28 +0200'>2018-06-01</span></td><td><a href='/guix/commit/gnu/bootloader?id=31a5d694a3b9200bfde253eafbaca118b773fb96'>bootloader: grub: Simplify 'svg-&gt;png'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-05-29 10:46:13 +0200'>2018-05-29</span></td><td><a href='/guix/commit/gnu/bootloader?id=6fe165770539a4551b303dc5cd52db6c51c7604a'>system: Add u-boot-puma-rk3399.</a><span class='msg-avail'>...</span></td><td>Vagrant Cascadian</td></tr>
<tr><td><span title='2018-05-28 13:24:11 +0200'>2018-05-28</span></td><td><a href='/guix/commit/gnu/bootloader?id=a5acc17a3c10a3779b5b8b1a2565ef130be77e51'>file-systems: Remove 'title' field and add &lt;file-system-label&gt;.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-05-18 20:21:30 +0200'>2018-05-18</span></td><td><a href='/guix/commit/gnu/bootloader?id=9f7d66656646fac3746c52216ad6061c9c0adc27'>system: Add u-boot-pine64-plus installer.</a><span class='msg-avail'>...</span></td><td>Vagrant Cascadian</td></tr>
<tr><td><span title='2018-05-12 09:37:35 +0200'>2018-05-12</span></td><td><a href='/guix/commit/gnu/bootloader?id=afca98ff01e036594778ab687f472ef5d759f653'>bootloader: extlinux: Fix menu support with u-boot.</a><span class='msg-avail'>...</span></td><td>Vagrant Cascadian</td></tr>
<tr><td><span title='2018-05-11 12:25:43 +0200'>2018-05-11</span></td><td><a href='/guix/commit/gnu/bootloader?id=1b960787e21eb746df051592094478dd5ce8bcbb'>system: Add u-boot-novena installer.</a><span class='msg-avail'>...</span></td><td>Vagrant Cascadian</td></tr>
<tr><td><span title='2018-05-11 12:25:25 +0200'>2018-05-11</span></td><td><a href='/guix/commit/gnu/bootloader?id=fd5536e32b7896e46daf55a52805ea020e43b088'>system: Add wandboard installer.</a><span class='msg-avail'>...</span></td><td>Vagrant Cascadian</td></tr>
<tr><td><span title='2018-05-11 12:25:25 +0200'>2018-05-11</span></td><td><a href='/guix/commit/gnu/bootloader?id=07ca90458f34e425416f37bc7fcd5b178ab6734a'>system: Add mx6cuboxi installer.</a><span class='msg-avail'>...</span></td><td>Vagrant Cascadian</td></tr>