FIPS SLI revamp: __thread check is sensitive to compiler flags

[Lucas Mulling]

Hi,

We were backporting FIPS SLI changes to 1.10.3, in our target environment
`-Wall` and -`Werror=unused-variable` are set, making the check for
`__thread` fail. FYI if anyone else has this problem, fix attached.

Thanks,
Lucas Mülling
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.gnupg.org/pipermail/gcrypt-devel/attachments/20250108/afd359b1/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: fix-__thread-check.patch
Type: text/x-patch
Size: 668 bytes
Desc: not available
URL: <https://lists.gnupg.org/pipermail/gcrypt-devel/attachments/20250108/afd359b1/attachment.bin>