Enable --incompatible_disallow_filetype by default.

Fixes #5831

RELNOTES: --incompatible_disallow_filetype is enabled by default.
PiperOrigin-RevId: 233808118
diff --git a/src/main/java/com/google/devtools/build/lib/syntax/SkylarkSemantics.java b/src/main/java/com/google/devtools/build/lib/syntax/SkylarkSemantics.java
index 3a7882a..de054dc 100644
--- a/src/main/java/com/google/devtools/build/lib/syntax/SkylarkSemantics.java
+++ b/src/main/java/com/google/devtools/build/lib/syntax/SkylarkSemantics.java
@@ -222,7 +222,7 @@
           .incompatibleDisableObjcProviderResources(false)
           .incompatibleDisallowDataTransition(true)
           .incompatibleDisallowDictPlus(false)
-          .incompatibleDisallowFileType(false)
+          .incompatibleDisallowFileType(true)
           .incompatibleDisallowLegacyJavaProvider(false)
           .incompatibleDisallowLegacyJavaInfo(false)
           .incompatibleDisallowLoadLabelsToCrossPackageBoundaries(false)