[vte/vte-0-70] build: Add define for darwin

[Christian Persch <chpe src gnome org>]

commit 1f1f177ff797ac2bb453168951135865cfded900
Author: Christian Persch <chpe src gnome org>
Date:   Fri Sep 23 16:26:27 2022 +0200

    build: Add define for darwin
    
    Fixes: https://gitlab.gnome.org/GNOME/vte/-/issues/2592
    (cherry picked from commit 8ef3f6b2f8043d28cbc82520eb094f09333b26ae)

 meson.build | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/meson.build b/meson.build
index 1377e971..51da7d71 100644
--- a/meson.build
+++ b/meson.build
@@ -229,6 +229,12 @@ 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', '1'],