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

[Panu Matilainen]

@pmatilai commented on this pull request.



> +```
+%[ "%{aa}" == "5" ? 1 : 2]
+```
+
+## Example 7. Define a parametric Lua macro
+Define *%range* Lua macro that takes two integers as arguments and
+expands to the catenation of the numbers in the range:
+
+```
+%define range() %{lua:
+    for i=math.tointeger(arg[1]),math.tointeger(arg[2]) do
+        print(i)
+    end
+}
+```
+

Dropped this example from the main macro manual, it belongs to the to-be-added rpm-lua(7) instead.
We can try coming up with a better example there...

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