configure.ac: Clean up AC_ARG_{WITH, ENABLE} invocations, s/==/=/

* AC_ARG_ENABLE implicitly defines enable_debug; there's no point in
  performing extra work just to define with_debug with an identical
  value.

* The same applies to with_xtables and with_libxtables.

* The AS_IF block in the `AC_ARG_ENABLE([man-doc], ...` invocation is
  essentially a noop. All it does is to set enable_man_doc to `yes` if
  has a value that matches neither `yes` nor `no`. (This could happen if
  a user calls `configure --enable-man-doc=foo`, but that'd be a user
  error which we don't need to handle.)

* The correct operator for equality tests in `test` is `=`. Some
  implementations also support `==`, but this is not portable.

Signed-off-by: Luis Ressel <aranea@aixah.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

0 files changed, 0 insertions, 0 deletions