Make a collect-utils library for use by tools like collect2 and lto-wrapper.

Make a collect-utils library for use by tools like collect2 and lto-wrapper.

	* Makefile.in (ALL_HOST_BACKEND_OBJS): Add collect-utils.o.
	(lto-wrapper$(exeext)): Link with collect-utils.o.
	* collect-utils.c: New file.
	* collect-utils.h: New file.
	* lto-wrapper.c: Include "collect-utils.h".
	(args_name): Delete variable.
	(tool_name): New variable.
	(tool_cleanup): New function.
	(maybe_unlink): Renamed from maybe_unlink_file.  All callers changed.
	(lto_wrapper_cleanup, fatal_signal, collect_execute, collect_wait,
	fork_execute): Remove functions.

From-SVN: r212018