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

[Michal Domonkos]

@dmnks commented on this pull request.



> +Macro expansions can recurse up to 64 levels.
+
+## Shell expansion
+Shell expansion can be performed using *%(*_shell command_*)*.
+_shell_command_ is expanded before executing it with _/bin/sh_, whose output
+becomes the expansion of the macro. The trailing newline is deleted.
+
+Example:
+```
+%(echo aa-bb-cc | tr '-' '.')
+```
+
+## Conditional expansion
+The macro processor supports testing whether a macro is defined or not.
+
+*%{?macro_name:value}*

These should probably use the italics (underline) notation.

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