the current directory (build dir) not srcdir to find guile
executable. otherwise "make check" doesn't work with a separate
build directory. create the test log in
$build_dir/check-guile.log instead of in srcdir/test-suite
directory.
* configure.in: don't define or substitute test_suite_dir.
* guile-test: use #!/bogus-path/..., not #!/home/dirk/... in the
first line.
