[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 the *%[expression]* expansion is different to the
+*%{expr:expression}* macro.  With the latter, the macros in the
+expression are expanded first and then the expression is
+evaluated (without re-expanding the terms).  Thus
+
+```
+rpm --define 'foo 1 + 2' --eval '%{expr:%foo}'
+```
+
+will print *3*.  Using *%[%foo]* instead will result in the
+error that "1 + 2" is not a number.
+
+Doing the macro expansion when evaluating the terms has two
+advantages.  First, it allows rpm to do correct short-circuit
+processing when evaluation logical operators.  Second, the

evaluating

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