Skip the constraints check for :run_under.

It's an implementation artifact that we declare this as a late bound
dependency, and having checks here doesn't make a lot of sense.

--
MOS_MIGRATED_REVID=102976439
diff --git a/src/main/java/com/google/devtools/build/lib/analysis/BaseRuleClasses.java b/src/main/java/com/google/devtools/build/lib/analysis/BaseRuleClasses.java
index bb615d8..3a02238 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/BaseRuleClasses.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/BaseRuleClasses.java
@@ -175,7 +175,8 @@
 
           // The target itself and run_under both run on the same machine. We use the DATA config
           // here because the run_under acts like a data dependency (e.g. no LIPO optimization).
-          .add(attr(":run_under", LABEL).cfg(DATA).value(RUN_UNDER))
+          .add(attr(":run_under", LABEL).cfg(DATA).value(RUN_UNDER)
+              .skipConstraintsCheck())
           .build();
     }