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

[Panu Matilainen]

pmatilai commented on this pull request.



>  	%endif
 \endverbatim
 
-Conditionals are not macros, thus they can be used in spec files only.
+%ifos is used to control RPM's spec file processing according to the
+build system's operating system.
+
+%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"

To set a good example, for string comparisons it's best to quote both operands.

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