RFR: 8318696: Do not use LFS64 symbols on Linux [v4]

[Matthias Baesken]

On Fri, 19 Jan 2024 10:37:42 GMT, Sam James <duke at openjdk.org> wrote:

>> The LFS64 symbols provided by glibc are not part of any standard and were gated behind -D_LARGEFILE64_SOURCE in musl 1.2.4 (to be removed in 1.2.5). This commit replaces the usage of LFS64 symbols with their regular counterparts and defines -D_FILE_OFFSET_BITS=64, ensuring that functions will always act as their -64 variants on glibc.
>
> Sam James has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - sendfile64 -> sendfile
>    
>    Signed-off-by: Sam James <sam at gentoo.org>
>  - buf64->buf
>    
>    Signed-off-by: Sam James <sam at gentoo.org>

Looks good to me, but please also adjust COPYRIGHT headers (e.g. flags-cflags.m4) .

Btw. I can confirm that with your patch applied, the build is fixed on Alpine 3.19 (see also [JDK-8324153](https://bugs.openjdk.org/browse/JDK-8324153) build fails on Alpine x86_64 3.19  for details on the failures) .

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Marked as reviewed by mbaesken (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/16329#pullrequestreview-1832719082