Remove unnecessary flag for Kotlin compiles

This has been fixed in upstream Kotlin

Test: add /tmp/build.txt file and m metalava
Change-Id: I6d088548ee5a31452ad637bbdd75e26c8863926d
diff --git a/java/config/kotlin.go b/java/config/kotlin.go
index fc63f4d..e5e187c 100644
--- a/java/config/kotlin.go
+++ b/java/config/kotlin.go
@@ -49,8 +49,5 @@
 		"-J--add-opens=java.base/java.util=ALL-UNNAMED", // https://youtrack.jetbrains.com/issue/KT-43704
 	}, " "))
 
-	pctx.StaticVariable("KotlincGlobalFlags", strings.Join([]string{
-		// b/222162908: prevent kotlinc from reading /tmp/build.txt
-		"-Didea.plugins.compatible.build=999.SNAPSHOT",
-	}, " "))
+	pctx.StaticVariable("KotlincGlobalFlags", strings.Join([]string{}, " "))
 }