Reapply "cleanup dead code"

This reverts commit 1b11c12.

Author: aignas

python/private/pypi/evaluate_markers.bzl

@@ -14,20 +14,10 @@
 
 """A simple function that evaluates markers using a python interpreter."""
 
-load(":deps.bzl", "record_files")
 load(":pep508_env.bzl", "env", _platform_from_str = "platform_from_str")
 load(":pep508_evaluate.bzl", "evaluate")
 load(":pep508_req.bzl", _req = "requirement")
 
-# Used as a default value in a rule to ensure we fetch the dependencies.
-SRCS = [
-    # When the version, or any of the files in `packaging` package changes,
-    # this file will change as well.
-    record_files["pypi__packaging"],
-    Label("//python/private/pypi/requirements_parser:resolve_target_platforms.py"),
-    Label("//python/private/pypi/whl_installer:platform.py"),
-]
-
 def evaluate_markers(requirements):
     """Return the list of supported platforms per requirements line.