[Rpm-maint] [rpm-software-management/rpm] Improve description of conditionals + comments in spec documentation (#830)

[Panu Matilainen]

pmatilai commented on this pull request.



> +
+%if can be used for various purposes. The test can be evaluated based on
+the existence of a macro, like:
+\verbatim
+	%if %{defined with_foo} && %{undefined with_bar}
+\endverbatim
+string comparison:
+\verbatim
+	%if %{optimize_flags} != "none"
+\endverbatim
+or a mathematical statement:
+\verbatim
+	%if 0%{?fedora} > 10 || 0%{?rhel} > 7
+\endverbatim
+Generally, a mathematical statement allows to use logical operators
+&&, ||, !, relational operators !=, ==, <, > , <=, >= and parentheses.

Might as well document the rest of the mathematical operators as well (+-/*)

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