OR booleans together when appending configurables

This is to match how (non-pointer) booleans work in AppendProperties().

Bug: 323382414
Test: m nothing --no-skip-soong-tests
Change-Id: I16791fc5ac684eedf8064a65953b8b68f18c37c1

proptools/configurable.go

@@ -173,22 +173,16 @@ func mergeConfiguredValues[T ConfigurableElements](a, b *T, propertyName string,
 		result := a + b
 		return any(&result).(*T)
 	case *bool:
-		numNonNil := 0
-		var nonNil *T
+		// Addition of bools will OR them together. This is inherited behavior
+		// from how proptools.ExtendBasicType works with non-configurable bools.
+		result := false
 		if a != nil {
-			numNonNil += 1
-			nonNil = a
+			result = result || *any(a).(*bool)
 		}
 		if b != nil {
-			numNonNil += 1
-			nonNil = b
-		}
-		if numNonNil == 1 {
-			return nonNil
-		} else {
-			evalutor.PropertyErrorf(propertyName, "Cannot append bools")
-			return nil
+			result = result || *any(b).(*bool)
 		}
+		return any(&result).(*T)
 	default:
 		panic("Should be unreachable")
 	}