doc: Change yat2m to allow arbitrary condition names.
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doc: Change yat2m to allow arbitrary condition names.

* doc/yat2m.c (MAX_CONDITION_NESTING): New.
(gpgone_defined): Remove.
(condition_s, condition_stack, condition_stack_idx): New.
(cond_is_active, cond_in_verbatim): New.
(add_predefined_macro, set_macro, macro_set_p): New.
(evaluate_conditions, push_condition, pop_condition): New.
(parse_file): Rewrite to use the condition stack.
(top_parse_file): Set prefined macros.
(main): Change -D to define arbitrary macros.

This change allows the use of other conditionals than "gpgone" and
thus make "gpgtwoone" et al. actually work. It does now also track
conditionals over included files.

From GnuPG master commit a15c35f37ed2b58805adc213029998aa3e52f038