* incremental.cc (Sized_incremental_binary::setup_readers): Pass

	* incremental.cc (Sized_incremental_binary::setup_readers): Pass
	input file index to Script_info ctor.
	(Sized_incremental_binary::do_file_has_changed): Find the
	command-line argument for files named in scripts.
	* incremental.h (Script_info::Script_info): New ctor
	with input file index.
	(Script_info::input_file_index): New function.
	(Script_info::input_file_index_): New data member.
	(Incremental_binary::get_library): Add const.
	(Incremental_binary::get_script_info): Add const.
	* readsyms.cc (Read_member::is_runnable): Check for this_blocker_.
	* testsuite/Makefile.am (incremental_test_5): New test case.
	(incremental_test_6): New test case.
	* testsuite/Makefile.in: Regenerate.