Stop testing the ability to set licenses and distribs on a package level. (#1261)

The `distribs` and `licenses` features are being removed from Bazel.
Both are obsolete in the `package()` rule.
`distribs` as a top level function will be removed ina near release of
Bazel.

buildozer/buildozer_test.sh

diff --git a/buildozer/buildozer_test.sh b/buildozer/buildozer_test.sh
index 0f71b75..666d4b9 100755
--- a/buildozer/buildozer_test.sh
+++ b/buildozer/buildozer_test.sh
@@ -1007,26 +1007,6 @@
 )'
 }
 
-function test_set_licenses() {
-  in='cc_test(name = "a")'
-
-  run "$in" 'set licenses foo' '//pkg:a'
-  assert_equals 'cc_test(
-    name = "a",
-    licenses = ["foo"],
-)'
-}
-
-function test_set_distribs() {
-  in='cc_test(name = "a")'
-
-  run "$in" 'set distribs foo' '//pkg:a'
-  assert_equals 'cc_test(
-    name = "a",
-    distribs = ["foo"],
-)'
-}
-
 function test_set_if_absent_absent() {
   in='soy_js(name = "a")'
 

warn/warn_bazel.go

diff --git a/warn/warn_bazel.go b/warn/warn_bazel.go
index c7a3fc6..cd67c35 100644
--- a/warn/warn_bazel.go
+++ b/warn/warn_bazel.go
@@ -26,7 +26,6 @@
 )
 
 var functionsWithPositionalArguments = map[string]bool{
-	"distribs":            true,
 	"exports_files":       true,
 	"licenses":            true,
 	"print":               true,