x86_64 is used as a baseline: the "x86_64" entry, whatever status it has,
is transformed into "all", and then the other entries in ARCHITECTURES
either dropped or rearranged appropriately.
* Referring the current haiku version explicitly is not needed, since
the RequiresUpdater takes care of setting the version of Haiku used
for building a package.
https://dev.haiku-os.org/ticket/10064#comment:18
* Upload source code to GitHub.
* Update base code from Canna 3.5b2 to Canna 3.7p3.
* I think canna works with x86_64 now (feature of Canna 3.7).