Skylark interpreter uses Latin1 instead of Utf8 for consistency with Bazel.

RELNOTES: None.
PiperOrigin-RevId: 164899416
diff --git a/src/main/java/com/google/devtools/skylark/Skylark.java b/src/main/java/com/google/devtools/skylark/Skylark.java
index 3e4d77e..f7c7d11 100644
--- a/src/main/java/com/google/devtools/skylark/Skylark.java
+++ b/src/main/java/com/google/devtools/skylark/Skylark.java
@@ -24,6 +24,7 @@
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
+import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Paths;
@@ -49,8 +50,9 @@
         }
       };
 
+  private static final Charset CHARSET = StandardCharsets.ISO_8859_1;
   private final BufferedReader reader =
-      new BufferedReader(new InputStreamReader(System.in, StandardCharsets.UTF_8));
+      new BufferedReader(new InputStreamReader(System.in, CHARSET));
   private final Mutability mutability = Mutability.create("interpreter");
   private final Environment env =
       Environment.builder(mutability)
@@ -98,7 +100,7 @@
   public int execute(String path) {
     String content;
     try {
-      content = new String(Files.readAllBytes(Paths.get(path)), StandardCharsets.UTF_8);
+      content = new String(Files.readAllBytes(Paths.get(path)), CHARSET);
       BuildFileAST.eval(env, content);
       return 0;
     } catch (EvalException e) {