added better error handling to vault writing, always use a tmp

vault file for writing. added matching unittest to check if
the code catches a disk full error.

config/compile

@@ -1,7 +1,7 @@
 #! /bin/sh
 # Wrapper for compilers which do not understand '-c -o'.
 
-scriptversion=2012-10-14.11; # UTC
+scriptversion=2012-03-05.13; # UTC
 
 # Copyright (C) 1999-2012 Free Software Foundation, Inc.
 # Written by Tom Tromey <tromey@cygnus.com>.
@@ -112,11 +112,6 @@ func_cl_dashl ()
       lib=$dir/$lib.lib
       break
     fi
-    if test -f "$dir/lib$lib.a"; then
-      found=yes
-      lib=$dir/lib$lib.a
-      break
-    fi
   done
   IFS=$save_IFS