[ruby-core:122638] [Ruby Bug#21496] Fix for gcc-15 `-flto` option

[ruby-core:122638] [Ruby Bug#21496] Fix for gcc-15 `-flto` option

[nobu (Nobuyoshi Nakada) via ruby-core]

Issue #21496 has been reported by nobu (Nobuyoshi Nakada).

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Bug #21496: Fix for gcc-15 `-flto` option
https://bugs.ruby-lang.org/issues/21496

* Author: nobu (Nobuyoshi Nakada)
* Status: Closed
* Backport: 3.2: REQUIRED, 3.3: REQUIRED, 3.4: REQUIRED
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Even no prototype information is available, gcc-15 seems retrieve something when LTO is enabled.
As the result, `have_func` method may fail due to the inconsistency between the info and the default old-style declaration.

Possible fixes are:
* Specify the header file providing its proper prototype.
* Add the argument list to the first argument.

By the following commits, the extconf.h files generated with `-flto` option became same as without the option.

> commit:11fe8b26c14 [ruby/etc] Run `have_func` with the header providing the declarations
> commit:134bdf2d34a [ruby/io-console] Run `have_func` with the header providing the declarations
> commit:ac72a25a578 [ruby/io-nonblock] Run `have_func` with the header providing the declarations
> commit:89031666487 [ruby/io-wait] Run `have_func` with the header providing the declarations
> commit:5277ca1431a [ruby/openssl] Run `have_func` with the header providing the declarations
> commit:94803fe9e7b [ruby/strscan] Run `have_func` with the header providing the declarations
> commit:9d080765cc3 [ruby/json] Run `have_func` with the header providing the declarations




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