[Rpm-maint] [rpm] Permit dynamic selection of SCM. (#56)

[Andreas Scherer]

Invoking `%__scm_setup_$__scm` _without_ looking at option `-S` in the specfile, but taking the current definition of `%__scm` into account, permits dynamic selection of the SCM on the commandline
```
   rpmbuild --define="__scm SCM"
```
Default SCM `patch` already has a convenient `%__scm_setup_patch %{nil}` definition.

Tested with rpmbuild 4.13, git, svn, ... on Linux Mint 17.2.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/56

-- Commit Summary --

  * Permit dynamic selection of SCM.

-- File Changes --

    M macros.in (2)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/56.patch
https://github.com/rpm-software-management/rpm/pull/56.diff

---
Reply to this email directly or view it on GitHub:
https://github.com/rpm-software-management/rpm/pull/56
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