Remove LIBATOMIC

Author: vstinner

Doc/using/configure.rst

@@ -326,15 +326,6 @@ Linker Options
 
    Linker flags, e.g. ``-L<library directory>``.
 
-.. cmdoption:: LIBATOMIC
-
-   Linker flags when ``cpython/pyatomic.h`` header file is used.
-
-   Default: ``LIBATOMIC='-latomic'`` if ``libatomic`` is needed, or
-   ``LIBATOMIC=''`` otherwise (also the default when Python is cross-compiled).
-
-   .. versionadded:: 3.13
-
 .. cmdoption:: LIBS
 
    Libraries to pass to the linker, e.g. ``-l<library>``.