* Support optional ifdef parameters in the .hg macros,
to allow, for instance the --enable-atk=no option,
to disable the build and use of the atkmm API,
for use in embedded environments.
(Johannes Schimd, Murray Cuming, Openismus)
2.8.10:
* Build: Added the --enable-api-default-signal-handlers option, for use in
embedded environments that have reduced resources. See configure --help
for the other subsets.
