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
ko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=51f8d606658bd3813dc0a395c5fa5bb937f35559'>refs</a><a class='active' href='/guix/log/tests'>log</a><a href='/guix/tree/tests?id=51f8d606658bd3813dc0a395c5fa5bb937f35559'>tree</a><a href='/guix/commit/tests?id=51f8d606658bd3813dc0a395c5fa5bb937f35559'>commit</a><a href='/guix/diff/tests?id=51f8d606658bd3813dc0a395c5fa5bb937f35559'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/tests'>
<input type='hidden' name='id' value='51f8d606658bd3813dc0a395c5fa5bb937f35559'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=51f8d606658bd3813dc0a395c5fa5bb937f35559'>root</a>/<a href='/guix/log/tests?id=51f8d606658bd3813dc0a395c5fa5bb937f35559'>tests</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/tests?id=51f8d606658bd3813dc0a395c5fa5bb937f35559&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>