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.
* Drop unneeded calls to libtoolize and autoreconf.
* Install README in $developDocDir for primary arch builds.
* Drop $manDir on secondary arch builds.
* Sort BUILD_PREREQUIRES.
* Switch HOMEPAGE to https.
* Switch SOURCE_URI to tar.bz2.