cmdline: parse parameters in GNU mode

This change sets the option parser to GNU mode, that is, allows
further option parameters after non-option parameters, e.g.:

dump-trace foo.tc -s

instead of

dump-trace -s foo.tc

As Fail* currently works on GNU platforms only, this behavior is the
one presumably expected from users.

Change-Id: I9c55eaf4560cde81ebd0b94214201c8ad02c2b74

src/core/util/CommandLine.hpp

@@ -30,7 +30,7 @@ public:
 private:
 	static CommandLine m_instance;
 
-	std::vector<const char *> argv;
+	std::vector<const char *> argv, argv_reordered;
 	std::vector<option::Descriptor> options;
 	option::Option *parsed_options, *parsed_buffer;
 	option::Parser *m_parser;