Remove //constraints:false in favor of prelude//:none

Author: dtolnay

constraints/BUCK

@@ -1,9 +1,5 @@
 load(":defs.bzl", "constraint")
 
-constraint(
-    setting = "false",
-)
-
 constraint(
     setting = "sysroot-deps",
     values = [

defs.bzl

@@ -162,7 +162,7 @@ def _target_constraints(crate_root):
         ]
     else:
         target_compatible_with = select({
-            "DEFAULT": ["//constraints:false"],
+            "DEFAULT": ["prelude//:none"],
             "//constraints:compiler": [],
             "//constraints:library": [],
         })

platforms/exec/BUCK

@@ -2,7 +2,7 @@ alias(
     name = "os_lookup",
     actual = "prelude//os_lookup/targets:os_lookup",
     target_compatible_with = select({
-        "DEFAULT": ["//constraints:false"],
+        "DEFAULT": ["prelude//:none"],
         "prelude//os:linux": [],
         "prelude//os:macos": [],
         "prelude//os:windows": [],
@@ -14,7 +14,7 @@ alias(
     name = "http_archive",
     actual = "prelude//http_archive/tools:exec_deps",
     target_compatible_with = select({
-        "DEFAULT": ["//constraints:false"],
+        "DEFAULT": ["prelude//:none"],
         "prelude//os:linux": [],
         "prelude//os:macos": [],
         "prelude//os:windows": [],