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

[Michal Domonkos]

@dmnks commented on this pull request.



> +Note that *%if*, *%ifarch* and the like are not macros, they are spec
+directives and only usable in that context.
+
+Note that in rpm >= 4.17, conditionals on built-in macros simply test for
+existence of that built-in, just like with any other macros.
+In older versions, the behavior of conditionals on built-ins is undefined.
+
+## Expression expansion
+Expression expansion can be performed using *%[expression]*.  An
+expression consists of terms that can be combined using
+operators.
+
+Rpm supports three kinds of terms:
+- numbers made up from digits
+- strings enclosed in double quotes (eg *"somestring"*)
+- versions enclosed in double quotes preceded by *v* (eg *v"3:1.2-1"*).

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