[patch] Remove unused code

[Ralf Corsepius]

Hi,

tools/genpkglist.cc and tools/gensrclist.cc both apply
scandir and alphasort.

tools/gensrclist.cc unconditionally expects the system libs to provide
them.

tools/genpkglist.cc, however contains some broken magic to conditionally
build local versions, seemingly "borrowed from glibc", seemingly aiming
at supporting ancient glibc-based systems.

Nowadays, systems not shipping scandir and alphasort have become rare.
Given the facts, gensrclist.cc had been shipped without local versions
of scandir/alphasort for quite a while, the configuration magic in
apt-repomd being broken, and seemingly nobody having tripped of this
issue, IMO justifies to remove the code in question.

=> I am proposing the patch enclosed below.

Ralf



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