devel/godot: add proper architecture detection

uname -p should be used instead of uname -m.

devel/godot/files/patch-platform__methods.py

@@ -0,0 +1,21 @@
+--- platform_methods.py.orig	2023-03-23 23:40:42 UTC
++++ platform_methods.py
+@@ -92,6 +92,9 @@ architecture_aliases = {
+     "rv": "rv64",
+     "riscv": "rv64",
+     "riscv64": "rv64",
++    "powerpc64le": "ppc64",
++    "powerpc64": "ppc64",
++    "powerpc": "ppc32",
+     "ppcle": "ppc32",
+     "ppc": "ppc32",
+     "ppc64le": "ppc64",
+@@ -99,7 +102,7 @@ def detect_arch():
+ 
+ 
+ def detect_arch():
+-    host_machine = platform.machine().lower()
++    host_machine = platform.processor().lower()
+     if host_machine in architectures:
+         return host_machine
+     elif host_machine in architecture_aliases.keys():