Reapply "add bzl libs"

This reverts commit 05a4612.

Author: aignas

python/private/pypi/BUILD.bazel

@@ -75,7 +75,9 @@ bzl_library(
     name = "evaluate_markers_bzl",
     srcs = ["evaluate_markers.bzl"],
     deps = [
-        ":pypi_repo_utils_bzl",
+        ":pep508_env_bzl",
+        ":pep508_evaluate_bzl",
+        ":pep508_req_bzl",
     ],
 )
 
@@ -208,6 +210,33 @@ bzl_library(
     ],
 )
 
+bzl_library(
+    name = "pep508_evaluate_bzl",
+    srcs = ["pep508_evaluate.bzl"],
+    deps = [
+        "//python/private:enum_bzl",
+        "//python/private:semver_bzl",
+    ],
+)
+
+bzl_library(
+    name = "pep508_req_bzl",
+    srcs = ["pep508_req.bzl"],
+    deps = [
+        "//python/private:normalize_name_bzl",
+    ],
+)
+
+bzl_library(
+    name = "pep508_env_bzl",
+    srcs = ["pep508_env.bzl"],
+    deps = [
+        ":pep508_evaluate_bzl",
+        ":pep508_req_bzl",
+        "//python/private:normalize_name_bzl",
+    ],
+)
+
 bzl_library(
     name = "pip_bzl",
     srcs = ["pip.bzl"],