#23 ./configure -help shows bogus default values

[Benjamin Peter]

The ./configure -help dialog does not show the right default values.

--enable-gtk2-client Enable compilation of gtk2-client,
${default_gtk2_client}
--enable-gtk2-tfw Enable compilation of gtk testing framework,
${default_gtk2_tfw}
--enable-debug Enable debug symbols for gdb, default yes
--enable-loopback Enable or disable loopback mode for data server,
default ${default_loopback}

It seems like it is not possible to use the values like that in the configure.ac but there is a way via scripts that I don't know currently.

Either make them static or use the scripts.