Fix build failure on glibc 2.28 where 'renameat2' would end up being
declared twice: <https://github.com/systemd/casync/issues/166>.

From 625244ca47e8ee1375d2d0092271bfd13b0913ea Mon Sep 17 00:00:00 2001
From: Daniel Mack <daniel@zonque.org>
Date: Tue, 13 Nov 2018 17:52:48 +0100
Subject: [PATCH] meson.build: pass -D_GNU_SOURCE when checking for functions

As described in #166, -D_GNU_SOURCE needs to be passed to the meson function
availability checker. h/t to @tomeon for providing a link to the solution as
well.
---
 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meson.build b/meson.build
index f42ed16..c0f741e 100644
--- a/meson.build
+++ b/meson.build
@@ -78,6 +78,6 @@ foreach ident : [
         ['copy_file_range',   '''#include <sys/syscall.h>
                                  #include <unistd.h>'''],
 ]
-        have = cc.has_function(ident[0], prefix : ident[1])
+        have = cc.has_function(ident[0], args : '-D_GNU_SOURCE', prefix : ident[1])
         conf.set10('HAVE_' + ident[0].to_upper(), have)
 endforeach
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<tr><td><span title='2023-03-13 15:08:32 +0100'>2023-03-13</span></td><td><a href='/guix/commit/tests?id=9fb8a480d5aec9186908e92ad18b31455f4aab6b'>packages: Consider 'patches' by 'package-direct-sources'.</a><span class='msg-avail'>...</span></td><td>Simon Tournier</td></tr>
<tr><td><span title='2023-03-07 11:39:50 +0100'>2023-03-07</span></td><td><a href='/guix/commit/tests?id=0a37921d851b94aef6900214098dc5bd62b46e26'>read-print: Correctly handle comments that follow a list head.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-02-27 23:40:43 +0100'>2023-02-27</span></td><td><a href='/guix/commit/tests?id=92a0e60a963a54230e400c5c2ae585205489bf35'>pack: Adjust shell tests to read-only tarball root.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-02-27 15:54:09 +0100'>2023-02-27</span></td><td><a href='/guix/commit/tests?id=fee1d08f0dd183ef78bcb9f1534d7b9e7f1df7ac'>pack: Make sure tests can run without a world rebuild.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-02-26 10:19:36 +0100'>2023-02-26</span></td><td><a href='/guix/commit/tests?id=84549dcf380b1ed7712816a1ff1bfe9688c1d9a7'>import: hackage: Add upstream-name property.</a><span class='msg-avail'>...</span></td><td>Lars-Dominik Braun</td></tr>
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