[Bug build/22862] _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is

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https://sourceware.org/bugzilla/show_bug.cgi?id=22862

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=862b45026fa67277a554eb329538a7d536311eca

commit 862b45026fa67277a554eb329538a7d536311eca
Author: Rical Jasan <ricaljasan@pacific.net>
Date:   Mon Feb 19 04:37:16 2018 -0800

    manual: Update _DEFAULT_SOURCE.  [BZ #22862]

    The description of the interplay between feature test macros and
    compiler options in the description of _DEFAULT_SOURCE is a little
    confusing, and dated, so clarify the situation, and don't assume a
    specific value for _DEFAULT_SOURCE.

    Also, _DEFAULT_SOURCE is supposed to be defined if none of the C/POSIX
    feature test macros are defined, but the condition was lacking a test
    for _ISOC11_SOURCE, so that is also addressed.

        [BZ #22862]
        * include/features.h: Add _ISOC11_SOURCE to test for whether
        to define _DEFAULT_SOURCE.
        * manual/creature.texi (_DEFAULT_SOURCE): Improve
        documentation.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog            |    7 +++++++
 include/features.h   |    2 +-
 manual/creature.texi |   21 ++++++++++++++-------
 3 files changed, 22 insertions(+), 8 deletions(-)

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