- Remove EX_AMCOND() and EX_FEAT_EXPORT(), instead add flags to
EX_FEAT() to check whether a feature should be exported.
- Only mark a feature to be exported with AM_CONDITIONAL() when
it is checked within either */Makefile.am or tests/atlocal.in.
- Only add a feature to test/atlocal.in when it is checked by
ATX_FEAT_*().
- Move feature "bookmarkfs-util" after features that may enable it,
so that its enable status can be correctly displayed.
- Move common `AC_DEFINE()` usage to `EX_FEAT()`.
- Remove unused argument `action-if-disabled` for `EX_FEAT()`.
- Conditionally enable features by default.
