gnulib: update to bd11400942d6

gnulib: update to bd11400942d6

Update the gnulib import to fixes these issues:

  - GDB build with clang + glibc < 2.33.

      https://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=d6a07b4dc21b3118727743142c678858df442853
      https://lists.gnu.org/archive/html/bug-gnulib/2022-04/msg00072.html

    With glibc < 2.33, gnulib (since relatively recently) enables a
    replacement for free (see gnulib/import/m4/free.m4).  In that path,
    clang shows this error:

        make[2]: Entering directory '/home/smarchi/build/binutils-gdb-clang/gdbsupport'
          CXX      agent.o
        In file included from /home/smarchi/src/binutils-gdb/gdbsupport/agent.cc:20:
        In file included from /home/smarchi/src/binutils-gdb/gdbsupport/common-defs.h:95:
        ../gnulib/import/string.h:636:19: error: exception specification in declaration does not match previous declaration
        _GL_EXTERN_C void free (void *) throw ();
                          ^
        ../gnulib/import/stdlib.h:737:17: note: expanded from macro 'free'
        #   define free rpl_free
                        ^
        ../gnulib/import/stdlib.h:739:1: note: previous declaration is here
        _GL_FUNCDECL_RPL (free, void, (void *ptr));
        ^
        ../gnulib/import/sys/select.h:251:23: note: expanded from macro '_GL_FUNCDECL_RPL'
          _GL_FUNCDECL_RPL_1 (rpl_##func, rettype, parameters_and_attributes)
                              ^
        <scratch space>:139:1: note: expanded from here
        rpl_free
        ^

    The gnulib commit mentioned fixes the exception specification of `free`.

 - GDB build on RHEL 7:

      CC       libgnu_a-openat-proc.o
    In file included from /usr/include/string.h:633,
                     from ./string.h:41,
                     from ../../../binutils-gdb/gnulib/import/openat-proc.c:30:
    ./string.h:1105:1: error: expected identifier or '(' before '__extension__'
     1105 | _GL_FUNCDECL_SYS (strndup, char *,
          | ^~~~~~~~~~~~~~~~

     https://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=84863a1c4dc8cca8fb0f6f670f67779cdd2d543b
     https://lists.gnu.org/archive/html/bug-gnulib/2022-04/msg00075.html

Change-Id: Ibd51302feece6f385d0c53e0d08921b5d95e2776