[test] libatexit: leverage __{BEGIN,END}_DECLS

This change converts the longhand form of `extern "C" {` and its
corresponding `}` into `__BEGIN_DECLS` and `__END_DECLS`, respectively.

The new form

[test] libatexit: leverage __{BEGIN,END}_DECLS

This change converts the longhand form of `extern "C" {` and its
corresponding `}` into `__BEGIN_DECLS` and `__END_DECLS`, respectively.

The new form is much easier to grep for and is a best practice to use in
the FreeBSD tree.

This is meant to be a non-functional change.

MFC after: 1 week

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libc: tests: add static to resolve -Wmissing-prototypes

The function create_staticobj() is only used inside this translation unit.
Clang produces a -Wmissing-prototypes warning during standard build

libc: tests: add static to resolve -Wmissing-prototypes

The function create_staticobj() is only used inside this translation unit.
Clang produces a -Wmissing-prototypes warning during standard buildworld.
This warning will become a fatal compile error if MK_WERROR is enabled for hardened builds.

PR: 285870
Fixes: ee9ce1078 ("libc: tests: add some tests for __cxa_atexit...")
Signed-off-by: Zhang Qiyue <peter-open-source.probing805@aleeas.com>
Reviewed-by: ngie
Pull-Request: https://github.com/freebsd/freebsd-src/pull/2321

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