gcc.c: Include diagnostic.h.

gcc.c: Include diagnostic.h.

	* gcc.c: Include diagnostic.h.
	(error_count): Remove.  All users changed to use errorcount.
	(programname): Remove.  All users changed to use progname.
	(fancy_abort, internal_error, fatal_error, error, warning, inform,
	fnotice): Remove.
	(execute): Don't include "Internal error" and bug reporting
	information in argument of internal_error call.
	(process_command): Don't increment error_count after calling
	perror_with_name.
	(input_filename): Rename to gcc_input_filename.  All users
	changed.
	(main): Call diagnostic_initialize.  Register delete_temp_files
	with atexit.  Use seen_error to test for errors.
	* gcc.h: Include diagnostic-core.h.
	(fatal_error, error, warning): Remove.
	* Makefile.in (GCC_H): Add $(DIAGNOSTIC_CORE_H).
	(GCC_OBJS): Add diagnostic.o, pretty-print.o and input.o.
	(gcc.o): Update dependencies.

From-SVN: r160004