Avoid updates to FrozenModules.java when just newlines change away from unix

(cherry picked from commit ba017ce)

Author: timfel

graalpython/com.oracle.graal.python.frozen/freeze_modules.py

@@ -589,19 +589,27 @@ def write_frozen_module_file(file, modules):
     if os.path.exists(file):
         with open(file, "r", encoding="utf-8", newline=os.linesep) as f:
             content = f.read()
+        if os.linesep != "\n":
+            if content.replace(os.linesep, "\n") == content:
+                # Windows file has Unix line endings
+                linesep = "\n"
+            else:
+                linesep = os.linesep
+        else:
+            linesep = "\n"
         stat_result = os.stat(file)
         atime, mtime = stat_result.st_atime, stat_result.st_mtime
     else:
         content = None
     os.makedirs(os.path.dirname(file), exist_ok=True)
-    with open(file, "w", encoding="utf-8", newline=os.linesep) as out_file:
+    with open(file, "w", encoding="utf-8", newline=linesep) as out_file:
         out_file.write(FROZEN_MODULES_HEADER)
         out_file.write("\n\n")
         write_frozen_modules_map(out_file, modules)
         out_file.write("\n")
         write_frozen_lookup(out_file, modules)
         out_file.write("}\n")
-    with open(file, "r", encoding="utf-8", newline=os.linesep) as f:
+    with open(file, "r", encoding="utf-8", newline=linesep) as f:
         new_content = f.read()
     if new_content == content:
         # set mtime to the old one, if we didn't change anything