parse-datetime: Simplify

[Bruno Haible]

These two patches simplify the 'parse-datetime' module:

- Since the module requires Bison, and the Bison-generated parser does not
  use the return value of the yyerror() function, this function can just as
  well return 'void'.

- The Makefile rules for generating two files from a single .y file are
  complicated. But the .h file generated by bison is not needed. We can
  tell Bison to generate only a .c file; this simplifies the Makefile rules.


2024-03-09  Bruno Haible  <bruno@clisp.org>

        parse-datetime: Simplify.
        * modules/parse-datetime (Makefile.am): Don't generate
        parse-datetime-gen.h.

2024-03-09  Bruno Haible  <bruno@clisp.org>

        parse-datetime: Simplify.
        * lib/parse-datetime.y (yyerror): Change return type to 'void'.

0001-parse-datetime-Simplify.patch
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0002-parse-datetime-Simplify.patch
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