Revert of Linux build: Use sysroot when calculating dependencies

third_party/dpkg-dev/scripts/Dpkg/File.pm

-# Copyright © 2011 Raphaël Hertzog <hertzog@debian.org>
-# Copyright © 2012 Guillem Jover <guillem@debian.org>
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-package Dpkg::File;
-
-use strict;
-use warnings;
-
-our $VERSION = '0.01';
-
-use Fcntl qw(:flock);
-use Dpkg::Gettext;
-use Dpkg::ErrorHandling;
-
-use Exporter qw(import);
-our @EXPORT = qw(file_lock file_slurp);
-
-sub file_lock($$) {
-    my ($fh, $filename) = @_;
-
-    # A strict dependency on libfile-fcntllock-perl being it an XS module,
-    # and dpkg-dev indirectly making use of it, makes building new perl
-    # package which bump the perl ABI impossible as these packages cannot
-    # be installed alongside.
-    eval 'use File::FcntlLock';
-    if ($@) {
-        warning(_g('File::FcntlLock not available; using flock which is not NFS-safe'));
-        flock($fh, LOCK_EX)
-            or syserr(_g('failed to get a write lock on %s'), $filename);
-    } else {
-        eval q{
-            my $fs = File::FcntlLock->new(l_type => F_WRLCK);
-            $fs->lock($fh, F_SETLKW)
-                or syserr(_g('failed to get a write lock on %s'), $filename);
-        }
-    }
-}
-
-sub file_slurp {
-    my ($fh) = @_;
-
-    local $/;
-    my $data = <$fh>;
-    return $data;
-}
-
-1;