Skip whitespace test if aclocal is not present.

[Ralf Wildenhues]

This test failed to test for presence of aclocal.  Fixed as below.

Cheers,
Ralf

    * tests/tools.at (autotools and whitespace in file names): Skip
    if aclocal is not present.

diff --git a/tests/tools.at b/tests/tools.at
index 1b3dca5..2e50180 100644
--- a/tests/tools.at
+++ b/tests/tools.at
@@ -2,7 +2,7 @@
 
 AT_BANNER([Executables (autoheader, autoupdate...).])
 
-# Copyright (C) 2000, 2001, 2003, 2004, 2006, 2007 Free Software
+# Copyright (C) 2000, 2001, 2003, 2004, 2006, 2007, 2008 Free Software
 # Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
@@ -984,6 +984,9 @@ AT_CLEANUP
 
 AT_SETUP([autotools and whitespace in file names])
 
+# We use aclocal.
+AT_CHECK([aclocal --version || exit 77], [], [ignore], [ignore])
+
 x=
 export x
 rm -f a b