* gdbtk-hooks.c: Remove gdbtk_ignorable_warning prototype.
It is in gdbtk.h.
(report_error): New function. Displays debugging information
if a hook function fails. All hook functions should probably
call this.
(gdbtk_warning): Call report_error() if there is a problem.
(gdbtk_register_changed): Call report_error() if there is a problem.
(gdbtk_memory_changed): Call report_error() if there is a problem.
(gdbtk_ignorable_warning): Pass along class argument. If there
is a problem, call report_error().
* gdbtk-cmds.c: Remove TclDebug prototype. It is in gdbtk.h.
(gdb_loadfile): Add class name to gdbtk_ignorable_warning call.