PR macros/12999

PR macros/12999
* macrotab.h (macro_callback_fn): Add new arguments to callback.
* macrotab.c (foreach_macro): Ditto.
(foreach_macro_in_scope): Ditto.
* macrocmd.c (print_macro_callback): New function.
(info_macro_command): Move some code to print_macro_definition.
(print_macro_definition): New function.
(print_one_macro): Add new arguments to callback.

testsuite/
* gdb.base/info-macros.c: New test sources.
* gdb.base/info-macros.exp: New tests.

docs/
* gdb.texinfo (Macros): Add info definitions and info macros commands.
Update text and cindex entries for info macro command.