* diagnostic.c (default_print_error_function): Tweak.
	(report_error_function): Likewise.
	* toplev.h (default_print_error_function): Move to...
	* diagnostic.h: ...here. Add a `diagnostic_context *' parameter.
	* tree.h (print_error_function): Move to...
	* diagnostic.h: ...here. Add a `diagnostic_context *' parameter.

ch/

	* lang.c: #include diagnostic.h
	(chill_print_error_function): Add a dummy `diagnostic_context *'.
	* Makefile.in (lang.o): Depend on diagnostic.h

cp/

	* error.c (lang_print_error_function): Add a `diagnostic_context *'
	parameter. Tweak.

f/

	* Make-lang.in (f/com.o): Depend on diagnostic.h
	* com.c: #include diagnostic.h
	(lang_print_error_function): Take a 'diagnostic_context *'.

java/

	* lang.c: #include diagnostic.h
	(lang_print_error): Add a `diagnostic_context *' parameter.
	(java_dummy_print): Likewise.
	* Make-lang.in (JAVA_LEX_C): Depend on diagnostic.h

From-SVN: r43638