Fixed incorrect iterator advancing

[Flast]

args always doesn't contain program name, so it shouldn't advance the iterator at first.

Callers are always skipping its name.

regression/testing/src/process_jam_log.cpp

Lines 21 to 26 in 4d4c503

	int main( int argc, char ** argv )
	{
	std::vector<std::string> args;
	while ( argc > 1 )
	{
	args.push_back( argv[1] );

regression/library_status/src/library_status.cpp

Lines 925 to 933 in 4d4c503

	int cpp_main( int argc, char * argv[] ) // note name!
	{
	std::vector<std::string> process_jam_log_args;
	std::vector<std::string> library_status_args;
	std::vector<std::string> b2_args;
	std::string log_name;
	process_jam_log_args.push_back("process_jam_log");
	library_status_args.push_back("library_status");
	--argc; ++argv;