[Bug gdb/23558] New: Regression: REPLACE_GETCWD gets set to 1 when cross-compiling

["b7.10110111 at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23558

            Bug ID: 23558
           Summary: Regression: REPLACE_GETCWD gets set to 1 when
                    cross-compiling
           Product: gdb
           Version: 8.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: b7.10110111 at gmail dot com
  Target Milestone: ---

After some time, cross-compiling gdb for armv5 and aarch64 uses rpl_getcwd
instead of normal getcwd. This results in crashes on startup (bug 23555) due to
failure to determine current directory on Android 8.0 (logged in via
SimpleSSHD), unless run as root.

git-bisect reports the following commit as the culprit:

6ec2e0f5bddc69d55e09fe56792edf7a109ff8ae is the first bad commit
commit 6ec2e0f5bddc69d55e09fe56792edf7a109ff8ae
Author: Sergio Durigan Junior <sergiodj@redhat.com>
Date:   Fri Sep 8 20:09:12 2017 -0400

    Import "glob" and "getcwd" modules from gnulib

Before this commit, REPLACE_GETCWD is 0, and the true getcwd system call is
called.

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