tools: consistently use 'sys.executable' instead of 'python' (#2950)

tools/lint.py

@@ -16,7 +16,7 @@ eslint = os.path.join(third_party_path, "node_modules", "eslint", "bin",
 
 os.chdir(root_path)
 run([
-    "python", cpplint, "--filter=-build/include_subdir",
+    sys.executable, cpplint, "--filter=-build/include_subdir",
     "--repository=core/libdeno", "--extensions=cc,h", "--recursive", "core"
 ])
 

tools/prebuilt.py

@@ -7,7 +7,7 @@ from third_party import tp, google_env
 
 def download_prebuilt(sha1_file):
     run([
-        "python",
+        sys.executable,
         tp('depot_tools/download_from_google_storage.py'),
         '--platform=' + sys.platform,
         '--no_auth',

tools/third_party.py

@@ -198,7 +198,7 @@ def download_from_google_storage(item, bucket):
         sha1_file = "v8/buildtools/linux64/%s.sha1" % item
 
     run([
-        "python",
+        sys.executable,
         tp('depot_tools/download_from_google_storage.py'),
         '--platform=' + sys.platform,
         '--no_auth',
@@ -254,13 +254,15 @@ def download_clang_format():
 
 # Download clang by calling the clang update script.
 def download_clang():
-    run(['python', tp('v8/tools/clang/scripts/update.py')], env=google_env())
+    run([sys.executable,
+         tp('v8/tools/clang/scripts/update.py')],
+        env=google_env())
 
 
 def maybe_download_sysroot():
     if sys.platform.startswith('linux'):
         run([
-            'python',
+            sys.executable,
             os.path.join(root_path,
                          'build/linux/sysroot_scripts/install-sysroot.py'),
             '--arch=amd64'