* Merge all except the x86_gcc2 one into a single "generic" one.
It is now exactly the same on all architectures, save a single
ifdef for x86_64, which needs a different compat version, as there
are still some packages built that far back and never rebuilt since!
* Group the requires according to category: first any arch packages,
then commands, then the GCC syslibs, then packages always depended
upon if they are available, and finally packages only depended upon
in "regular" builds.
* Put all packages inside HAIKU_BUILD_FEATURE_* ifdef tests,
and order them alphabetically within their category.
If I have done this all correctly, at least x86_64 should get an
identically generated haiku .PackageInfo as before this commit, save
the reordering changes. Others may differ based on package availability,
as they were missing the requisite #ifdef sections.
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