python3: fixed submodule build at least for x86

Signed-off-by: Joerg Seitter <adk@seitter.net>

package/python3/patches/patch-setup_py

@@ -0,0 +1,11 @@
+--- Python-3.8.2.orig/setup.py	2020-02-24 22:36:25.000000000 +0100
++++ Python-3.8.2/setup.py	2020-04-15 22:28:11.208150620 +0200
+@@ -654,7 +654,7 @@ class PyBuildExt(build_ext):
+         # only change this for cross builds for 3.3, issues on Mageia
+         if CROSS_COMPILING:
+             self.add_cross_compiling_paths()
+-        self.add_multiarch_paths()
++#        self.add_multiarch_paths()
+         self.add_ldflags_cppflags()
+ 
+     def init_inc_lib_dirs(self):