Enable AdvisoryModule bindings

There is a problem in Perl with namespace conflicts. Undefine
`get_context` to fix the issue.

More general solution would be to use `PERL_NO_SHORT_NAMES` it would fix
other potential conflicts however it doesn't compile with it.

Some more information is in: https://www.swig.org/Doc4.1/SWIGDocumentation.html#Perl5_nn9

bindings/libdnf5/advisory.i

@@ -25,11 +25,10 @@
     }
 }
 
-// TODO(jkolarik): advisory modules skipped for now
-
 %{
     #include "libdnf5/advisory/advisory.hpp"
     #include "libdnf5/advisory/advisory_package.hpp"
+    #include "libdnf5/advisory/advisory_module.hpp"
     #include "libdnf5/advisory/advisory_set.hpp"
     #include "libdnf5/advisory/advisory_set_iterator.hpp"
     #include "libdnf5/advisory/advisory_collection.hpp"
@@ -47,11 +46,12 @@
 %rename(value) libdnf5::advisory::AdvisorySetIterator::operator*();
 %include "libdnf5/advisory/advisory_set_iterator.hpp"
 
-%ignore libdnf5::advisory::AdvisoryCollection::get_modules();
+%include "libdnf5/advisory/advisory_module.hpp"
 %include "libdnf5/advisory/advisory_collection.hpp"
 %include "libdnf5/advisory/advisory_query.hpp"
 %include "libdnf5/advisory/advisory_reference.hpp"
 
+%template(VectorAdvisoryModule) std::vector<libdnf5::advisory::AdvisoryModule>;
 %template(VectorAdvisoryCollection) std::vector<libdnf5::advisory::AdvisoryCollection>;
 %template(VectorAdvisoryPackage) std::vector<libdnf5::advisory::AdvisoryPackage>;
 %template(VectorAdvisoryReference) std::vector<libdnf5::advisory::AdvisoryReference>;

bindings/libdnf5/shared.i

@@ -12,4 +12,12 @@
 
     // From perl5 - utf8.h: conflicts with fmt/format.h header
     #undef utf8_to_utf16
+
+    // Recent versions of Perl (5.8.0) have namespace conflict problems.
+    // Perl defines a bunch of short macros to make the Perl API function names shorter.
+    // For example, in /usr/lib64/perl5/CORE/embed.h there is:
+    // #define get_context Perl_get_context
+    // We have to undefine that since we don't want our AdvisoryModule::get_context to
+    // be renamed to Perl_get_context
+    #undef get_context
 %}