[gnome-terminal] build: Fix libc feature defines

[Christian Persch <chpe src gnome org>]

commit ba4c8fa15158fba8c723d631f827b929b9e5f0e9
Author: Christian Persch <chpe src gnome org>
Date:   Sat Sep 24 23:30:20 2022 +0200

    build: Fix libc feature defines

 meson.build | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 1530c8ff..8f8ae38f 100644
--- a/meson.build
+++ b/meson.build
@@ -177,9 +177,15 @@ if system == 'freebsd'
 
   libc_feature_defines = []
 
+elif system == 'darwin'
+  # See issue #2592
+  libc_feature_defines += [
+    ['_DARWIN_C_SOURCE', '1'],
+  ]
+
 elif system == 'netbsd'
   libc_feature_defines += [
-    '_NETBSD_SOURCE',
+    ['_NETBSD_SOURCE', '1'],
   ]
 endif