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

[Florian Festi]

@ffesti commented on this pull request.



> +Some useful tools for working with and troubleshooting macros:
+
+*rpm --eval "*_EXPRESSION_*"*
+	Expand macro _EXPRESSION_ on the command line.
+
+*rpm --define "aa 11" --eval "%aa"*
+	Define and evalue a macro on the command line.
+
+*rpmlua -e 'print(macros.defined("\_libdir"))'*
+	Using the embedded Lua interpreter in standalone form, print
+	print 1/0 whether macro *\_libdir* is defined or not.
+
+*rpmspec --shell telnet.spec*
+	Run interactive shell on the macro environment after parsing
+	*telnet.spec*.
+

May be add `rpmspec --shell` without a spec file, too

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