Silence automake warnings and add spl to make clean.
Add /config/compile to ignore list.

It is created by running automake, so it should not be considered part of
the normal 'make clean' process.
Log and require all autogen commands to succeed.
Update for newer autoconf/automake.

AC_INIT requires the name and version to be calculable by m4, and
AM_INIT_AUOTMAKE now should not take arguments.
Fix build warnings.