cryptography: fix build due to missing setup.py.

*** Building python3-cryptography *** [79/137]
python3 setup.py build --build-base /Users/catalinp/.cache/jhbuild/build/cryptography-42.0.2
python3: can't open file '/Users/catalinp/gtk/source/cryptography-42.0.2/setup.py': [Errno 2] No such file or directory

patches/cryptography-setup-py.patch

@@ -0,0 +1,16 @@
+commit 61401d62c557246600b45d09d471450e97b8c6f0
+Author: Catalin Patulea <[email protected]>
+Date:   Sat Jan 27 11:32:52 2024 +0000
+
+    Add skeleton setup.py.
+
+diff --git a/setup.py b/setup.py
+new file mode 100755
+index 0000000..851cb3f
+--- /dev/null
++++ b/setup.py
+@@ -0,0 +1,3 @@
++#!/usr/bin/env python3
++from setuptools import setup
++setup()
+\ No newline at end of file

xpra-python3.modules

@@ -191,7 +191,9 @@
 		<branch
                         module="c/cryptography/cryptography-42.0.2.tar.gz"
                         hash="sha256:e0ec52ba3c7f1b7d813cd52649a5b3ef1fc0d433219dc8c93827c57eab6cf888"
-                        version="42.0.2"/>
+                        version="42.0.2">
+			<patch file="cryptography-setup-py.patch" strip="1"/>
+		</branch>
 		<dependencies>
 			<dep package="python3"/>
 			<dep package="openssl"/>