Fixes for builddir != srcdir

[Raja R Harinath]

Hi,

The following patch makes it possible to use the testsuite in a
non-srcdir build. 

While testing autoupdate:

  * autoupdate calls 'autoconf -i --trace ...'
  * autoconf looks for autoconf.m4
  * $autoconf_dir = .., which is in the build directory, and so
    autoconf cannot find autoconf.m4

Part 1 of solution: Use $top_srcdir as $autoconf_dir

However,

  * autoconf.m4 includes acversion.m4, which is not in the source dir
  * acversion.m4 needs only be built by the maintainer
  * The current Makefiles will fail on distcheck due to acversion.m4 
    being in the builddir.

Part 2 of solution: Put acversion.m4 in $srcdir.  (While at it, put
created INSTALL.txt in $srcdir too.)

With these changes, the testsuite has only 5 fails.  4 are the
expected failures with autoupdate.  The other is a g77 problem for
which I'll file a separate bugreport.

autoconf.diff
Description: Fixes for builddir != srcdir

- Hari
-- 
Raja R Harinath ------------------------------ address@hidden
"When all else fails, read the instructions."      -- Cahn's Axiom
"Our policy is, when in doubt, do the right thing."   -- Roy L Ash