[bug#65600] [PATCH] Allow parameters AM_PROG_LEX

[Bogdan]

Hi.

 In reference to:
https://lists.gnu.org/archive/html/automake/2023-07/msg00007.html.

 The attached patch allows the AM_PROG_LEX macro to accept
parameters, to accommodate for the fact that AC_PROG_LEX now (since
Autoconf 2.70) requires one. The values accepted by AM_PROG_LEX are
passed to AC_PROG_LEX the following way:
- an empty value is passed as empty, resulting in an Autoconf warning
(just like it is now),
- the word 'yywrap' is passed unchanged,
- the word 'noyywrap' is passed unchanged,
- the word 'empty' results in an empty value (and thus an Autoconf
warning)
- any other word results in a syntax warning and an empty value being
passed (resulting in an Autoconf warning).

 Since it's Autoconf 2.70 that started using the parameter, I've
bumped the required value. You may change back if needed.

 My M4 "knowledge" is simply basing on other examples and doing
whatever that doesn't result in an error, so you may change the code
as needed (m4_define, m4_warn, m4_expand).

 Test for the parameters is added. All tests matching *lex*sh pass.
+11-20s to testing time.

--
Regards - Bogdan ('bogdro') D.                 (GNU/Linux & FreeDOS)
X86 assembly (DOS, GNU/Linux):    http://bogdro.evai.pl/index-en.php
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automake-am_prog_lex-params-mail.diff
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