Revert "turn on some better compiler warnings."

This reverts commit 78188317f96392e12e51e02f9a94150f0ac1786f.

Turns out that autogen.sh generates this properly, I had forgotten to
run that.

Thanks to L. Alberto for pointing this out.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>