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

[Michal Domonkos]

@dmnks commented on this pull request.



> +RPM has a powerful built-in macro processor. The primary uses of macros
+are configuration and other utility functions for RPM itself,
+and as a packaging aid in spec files.
+
+In addition to simple text substitution, the macro processor supports
+the following facilities:
+- function-like parametric macros with options and arguments processing
+  and locally scoped automatic and user-defined macros
+- various built-in primitives for string processing and OS interaction
+- shell expansion
+- expression expansion
+- embedded Lua expansion
+
+The macro definition syntax is:
+
+	_NAME_[([_OPTIONS_])] _BODY_

Oh right, good catch (as for separating). And indeed, "empty" options are rather common, as one would notice just by looking at some real macros :sweat_smile: 

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