libgpg-error t-printf test fails on powerpc and ppc64

[NIIBE Yutaka]

Hello,

John Paul Adrian Glaubitz <glaubitz at physik.fu-berlin.de> wrote:
> the t-printf test fails on both powerpc and ppc64 (both big-endian):
>
> t-printf: format "%.100Lf" with LDBL_MAX unexpectly did not fail
> FAIL: t-printf

This issue was reported to gnupg-users.

    https://lists.gnupg.org/pipermail/gnupg-users/2026-July/068440.html

I pushed a fix (to libgpg-error master) before my vacation:

	9cc750a816554e46d3e1496533f927b17ef3fcef

Today, I tested on perotto.debian.net and confirmed that:

	t-printf: IBM double-double - skipping LDBL_MAX test

The test is skipped correctly.

Thus, please wait for the next release of 1.62, or apply the commit
locally.
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