tests: get rid of ./defs, it's no longer used. * defs: Delete. * configure.ac (AC_CONFIG_LINKS): No longer link it. * t/ax/tap-setup.sh: Don't look for a file named 'defs' in the grandparent directory of the current test directory to decide whether we're running in the correct directory. * syntax-check.mk (xdefs): Remove '$(srcdir)/defs'. Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>