[Rpm-maint] [rpm-software-management/rpm] %setup -T -a 0 -a 1 doesn't extract %{S:0} (#462)

[Andreas Scherer]

Maybe `%autosetup` should be "internalized" in `parsePrep.c` alongside `%setup`? For the most part – after groking and converting some options – it would call `doSetupMacro()` (plus `%autopatch`).

Moreover, it would be possible to issue a more useful diagnostic if the user requests an unknown SCM – either with script option `-S svn` or with cli option `--define="__scm svn"`. ATTOW, it aborts from the stage script with
```
/var/tmp/rpm-tmp.428exb: 44: /var/tmp/rpm-tmp.428exb: %__scm_setup_svn: not found
Fehler: Fehler-Status beim Beenden von /var/tmp/rpm-tmp.428exb (%prep)
```
instead of with a more appropriate diagnostic like
```
%autosetup: option '-S svn' currently not supported at line 29.
```
pointing to line 29 of the specfile.

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