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

[Michael Schroeder]

@mlschroe commented on this pull request.



> +
+```
+%[ v"3.1.0-1" < v"1.0~alpha-2" ? 1 : 0]
+```
+
+Expands to *1* if *%aa* expands to *5*, otherwise expands to *2*:
+
+```
+%[ "%{aa}" == "5" ? 1 : 2]
+```
+
+# DEBUGGING
+Some useful tools for working with and troubleshooting macros:
+
+*rpm --eval "*_EXPRESSION_*"*
+	Expand macro _EXPRESSION_ on the command line.

This should IMHO be `VALUE`, not `EXPRESSION`. `EXPRESSION` is only used for expression expansion in the rest of the man page.

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