Revert "Fix file.copy recipe_module to not fail if files are already equal."

scripts/slave/recipes/v8/auto_roll_release_process.expected/same_lkgr.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec",
       "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'v8', 'url': 'https://chromium.googlesource.com/v8/v8'}]",
       "--patch_root",
       "v8",
@@ skipping 133 matching lines @@
     "stdout": "/path/to/tmp/",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@ref@74882b7a8e55268d1658f83efefa1c2585cee723@@@",
       "@@@STEP_LOG_END@ref@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
-      "\nimport shutil\nimport sys\n# Apparently, shutil.copy fails if files are binary-equal on *nix OSes.\n# See http://crbug.com/636168#c8.\nif hasattr(shutil, '_samefile'):\n  if shutil._samefile(sys.argv[1], sys.argv[2]):\n    sys.exit(0)\nshutil.copy(sys.argv[1], sys.argv[2])\n",
+      "\nimport shutil\nimport sys\nshutil.copy(sys.argv[1], sys.argv[2])\n",
       "[SLAVE_BUILD]/timestamp.txt",
       "/path/to/tmp/"
     ],
     "name": "check timestamp"
   },
   {
     "cmd": [
       "python",
       "-u",
       "[SLAVE_BUILD]/v8/tools/release/check_clusterfuzz.py",
@@ skipping 19 matching lines @@
       "There is no new candidate."
     ],
     "name": "log (3)"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]