Remove python2 support from soong rules

Python2 has been removed from the android build.

Removing the python version transition mutator should lead to some
slight analysis time performance improvements.

I also made embedded_launcher in base_properties no longer
blueprint:"mutated", so that we can migrate usages to the main property
struct and remove the `version` property struct.

Many python tests were not being run due to a
`if d.desc != "module with duplicate runfile path" { continue }` line,
I removed that and fixed the tests. I also removed the test for an
error when there are no source files, because that check has been
relaxed since, and I think it's legitimate to have a python library that
only has data files, not source files. And there are some of those
libraries in the source tree.

Bug: 203436762
Test: m nothing --no-skip-soong-tests
Change-Id: Idf18e39233418237ecc83f70f65d83d4ea496633

1 files changed, 0 insertions, 4 deletions

diff --git a/python/defaults.go b/python/defaults.go
index 3dc5bc4d2..b5ee2bcb1 100644
--- a/python/defaults.go
+++ b/python/defaults.go
@@ -18,10 +18,6 @@ import (
 	"android/soong/android"
 )
 
-func init() {
-	android.RegisterModuleType("python_defaults", DefaultsFactory)
-}
-
 type Defaults struct {
 	android.ModuleBase
 	android.DefaultsModuleBase