[Bug libc/22362] Installed crt1.o, crti,.o and crtn.o files are used with -m32

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=22362

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=340c6cf9bdf6734013f0c6b4e0d8f3a10fbd4ed0

commit 340c6cf9bdf6734013f0c6b4e0d8f3a10fbd4ed0
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Sat Oct 28 17:41:16 2017 -0700

    Use newly built crt*.o files to build shared objects [BZ #22362]

    When multi-lib GCC is used to build glibc, the search order of GCC driver
    for crt*.o is -B*/`gcc -print-multi-directory`, the installed diretory,
    -B*/.  This patch extends multi-lib support from nptl/Makefile to
    csu/Makefile so that -B/glibc-build-directory/csu/ will pick up the newly
    built crt*.o.

    Tested on x86-64 for i686 and x32.

        [BZ #22362]
        * config.make.in (multidir): New.
        * configure.ac (libc_cv_multidir): New.  AC_SUBST.
        * configure: Regenerated.
        * csu/Makefile [$(multidir) != .](multilib-extra-objs): New.
        [$(multidir) != .](extra-objs): Add $(multilib-extra-objs).
        [$(multidir) != .]($(addprefix $(objpfx)$(multidir)/, $(install-lib))):
        New target.
        * nptl/Makefile: Don't include multidir.mk.
        ($(objpfx)multidir.mk): Removed.

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