[Rpm-maint] [rpm-software-management/rpm] Add a man page for rpm macro processor (PR #3781)

[Panu Matilainen]

@pmatilai commented on this pull request.



> +specified by *%myprog* with it's first argument and always passing
+the option *--some-opt* to it, and additionally the *--xtra* option
+if it received the *-x* option itself:
+
+```
+%define myhelper(x) %{myprog} --some-opt %{?-x:--xtra} %{1}
+```
+
+## Example 3. Define a macro utilizing shell expansion
+Define macro *%today* that expands to the current date in _YYMMDD_
+format by calling the *date*(1) shell utility.
+Note the 2nd *%* needed to escape the arguments to *date*(1):
+
+```
+%define today %(date +%%y%%m%%d)
+```

Well it demonstrates getting something from the shell. I don't see how the exact format makes any difference.

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