build/pkgs/meson_python/patches: Add mesonbuild/meson-python#339

Author: Matthias Koeppe

build/pkgs/meson_python/patches/ARCHFLAGS_empty.patch

@@ -0,0 +1,21 @@
+commit caa435144b1b4fa40c51558f15fd8dae2c0b5868
+Author: Matthias Koeppe <[email protected]>
+Date:   Sat Mar 11 10:16:56 2023 -0800
+
+    BUG: handle ARCHFLAGS set to the empty string
+
+diff --git a/mesonpy/__init__.py b/mesonpy/__init__.py
+index e312059..d798f4c 100644
+--- a/mesonpy/__init__.py
++++ b/mesonpy/__init__.py
+@@ -686,8 +686,8 @@ class Project():
+ 
+         # setuptools-like ARCHFLAGS environment variable support
+         if sysconfig.get_platform().startswith('macosx-'):
+-            archflags = self._env.get('ARCHFLAGS')
+-            if archflags is not None:
++            archflags = self._env.get('ARCHFLAGS', '').strip()
++            if archflags:
+                 arch, *other = filter(None, (x.strip() for x in archflags.split('-arch')))
+                 if other:
+                     raise ConfigError(f'Multi-architecture builds are not supported but $ARCHFLAGS={archflags!r}')