build: fix native_mksnapshot build (#15770)

* build: fix native_mksnapshot build

When we changed our electron_mksnapshot_zip target to include the v8_context_snapshot_generator, this dependency made the `run_mksnapshot` target run which was trying to run an arm/arm64 binary on x64 hardware.

Don't use custom build args for native_mksnapshot as they are not needed

* Added comment on why snapshot_blob.bin is skipped on arm/arm64

build/args/native_mksnapshot.gn

@@ -1,2 +0,0 @@
-import("release.gn")
-v8_enable_i18n_support = false

build/zip.py

@@ -19,10 +19,17 @@ PATHS_TO_SKIP = [
   'pyproto',
 ]
 
-def skip_path(dep):
+def skip_path(dep, dist_zip, target_cpu):
+  # Skip specific paths and extensions as well as the following special case:
+  # snapshot_blob.bin is a dependency of mksnapshot.zip because
+  # v8_context_generator needs it, but this file does not get generated for arm
+  # and arm 64 binaries of mksnapshot since they are built on x64 hardware.
+  # Consumers of arm and arm64 mksnapshot can generate snapshot_blob.bin
+  # themselves by running mksnapshot.
   should_skip = (
     any(dep.startswith(path) for path in PATHS_TO_SKIP) or
-    any(dep.endswith(ext) for ext in EXTENSIONS_TO_SKIP))
+    any(dep.endswith(ext) for ext in EXTENSIONS_TO_SKIP) or
+    ('arm' in target_cpu and dist_zip == 'mksnapshot.zip' and dep == 'snapshot_blob.bin'))
   if should_skip:
     print("Skipping {}".format(dep))
   return should_skip
@@ -47,7 +54,7 @@ def main(argv):
   else:
     with zipfile.ZipFile(dist_zip, 'w', zipfile.ZIP_DEFLATED) as z:
       for dep in dist_files:
-        if skip_path(dep):
+        if skip_path(dep, dist_zip, target_cpu):
           continue
         if os.path.isdir(dep):
           for root, dirs, files in os.walk(dep):