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

[Development of GNU's TLS library]

Tim Rühsen commented on a discussion on configure.ac: https://gitlab.com/gnutls/gnutls/merge_requests/1008#note_174039507

>  
>  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

I agree, it's not documented (https://www.gnu.org/software/autoconf/manual/autoconf-2.66/html_node/Libraries.html). And using your `save_LIBS` approach is more readable and more widespread (though not not as elegant).

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