[gnutls-devel] GnuTLS | Do not add libraries in the global LIBS in configure (!1008)

[Development of GNU's TLS library]

Daiki Ueno started a new discussion on configure.ac: https://gitlab.com/gnutls/gnutls/merge_requests/1008#note_174019830

>  
>  dnl This ensures that we link with the right library for atomic operations on Linux SPARC
>  AC_SEARCH_LIBS([__atomic_load_4], [atomic], [], [AC_MSG_NOTICE([Could not detect libatomic])])
> +LIBS=$ac_func_search_save_LIBS

Is `ac_func_search_save_LIBS` a documented variable we can rely on?
If not, I would suggest to explicitly save/restore LIBS by adding:
```sh
save_LIBS=$LIBS
...
AC_SEARCH_LIBS(...)
...
LIBS=$save_LIBS
```

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