gmmproc: Verify that void methods should not return a value.

	* tools/gmmproc.in: ($main::return_mismatches): Add boolean to store
	whether method return mismatches should be checked.  Make it false by
	default.
	(parse_command_line_args): Add logic to parse a new
	--return-mismatches option to specify if gmmproc should verify that
	void methods should not return a value.
	(print_usage): Modify the usage message to describe the new option.

	For convenience, output the source for which there are unwrapped
	functions, properties and signals.

	* tools/pm/DocsParser.pm (remove_example_code): Also output the source
	being processed when the example code is removed (for convenience).
	* tools/pm/Output.pm (error): Once more, output the source being
	processed when an error occurs, for convenience.
	(convert_args_cpp_to_c): Add a check for when the C++ method for which
	the parameters are being converted returns void but the C function
	does not return void.  If the added option above is specified, output
	a warning.

	Bug #696364.

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