Add python3 embedded launcher support

Test: m par_test{,3}; build/soong/python/tests/runtest.sh
Change-Id: I9c0fac9e2947616fdeedbfc55026dc3065966e71
diff --git a/python/tests/runtest.sh b/python/tests/runtest.sh
index a319558..1ecdebc 100755
--- a/python/tests/runtest.sh
+++ b/python/tests/runtest.sh
@@ -23,8 +23,8 @@
   exit 1
 fi
 
-if [ ! -f $ANDROID_HOST_OUT/nativetest64/par_test/par_test ]; then
-  echo "Run 'm par_test' first"
+if [[ ( ! -f $ANDROID_HOST_OUT/nativetest64/par_test/par_test ) || ( ! -f $ANDROID_HOST_OUT/nativetest64/par_test3/par_test3 ) ]]; then
+  echo "Run 'm par_test par_test3' first"
   exit 1
 fi
 
@@ -36,4 +36,8 @@
 PYTHONHOME=/usr $ANDROID_HOST_OUT/nativetest64/par_test/par_test
 PYTHONPATH=/usr $ANDROID_HOST_OUT/nativetest64/par_test/par_test
 
+PYTHONHOME= PYTHONPATH= $ANDROID_HOST_OUT/nativetest64/par_test3/par_test3
+PYTHONHOME=/usr $ANDROID_HOST_OUT/nativetest64/par_test3/par_test3
+PYTHONPATH=/usr $ANDROID_HOST_OUT/nativetest64/par_test3/par_test3
+
 echo "Passed!"