Revert "remove platforms"

This reverts commit 4fc4b2a.

Author: chrisirhc

python/private/pypi/parse_requirements.bzl

@@ -227,6 +227,7 @@ def parse_requirements(
                         sdist = sdist,
                         platforms = [],
                     )
+                sdists_by_sha[sha].platforms.extend(target_platforms)
 
                 if len(whls) == 0:
                     continue

tests/pypi/extension/extension_tests.bzl

@@ -709,7 +709,7 @@ pip_fallback==0.0.1
                     struct(
                         config_setting = None,
                         filename = "simple-0.0.1.tar.gz",
-                        target_platforms = None,
+                        target_platforms = ("cp315_linux_aarch64", "cp315_linux_arm", "cp315_linux_ppc", "cp315_linux_s390x", "cp315_linux_x86_64", "cp315_osx_aarch64", "cp315_osx_x86_64", "cp315_windows_x86_64"),
                         version = "3.15",
                     ),
                 ],
@@ -766,7 +766,7 @@ pip_fallback==0.0.1
         },
         "pypi_315_simple_sdist_deadbeef": {
             "dep_template": "@pypi//{name}:{target}",
-            "experimental_target_platforms": [],
+            "experimental_target_platforms": ["cp315_linux_aarch64", "cp315_linux_arm", "cp315_linux_ppc", "cp315_linux_s390x", "cp315_linux_x86_64", "cp315_osx_aarch64", "cp315_osx_x86_64", "cp315_windows_x86_64"],
             "extra_pip_args": ["--extra-args-for-sdist-building"],
             "filename": "simple-0.0.1.tar.gz",
             "python_interpreter_target": "unit_test_interpreter_target",

tests/pypi/parse_requirements/parse_requirements_tests.bzl

@@ -234,7 +234,7 @@ def _test_direct_urls(env):
                     version = "",
                     url = "https://example.org/qux-1.0.tar.gz",
                 ),
-                target_platforms = [],
+                target_platforms = ["linux_x86_64"],
                 whls = [],
             ),
         ],
@@ -733,7 +733,7 @@ def _test_sdist_different_hashes(env):
                     url = "",
                     version = "0.0.1",
                 ),
-                target_platforms = [],
+                target_platforms = ["cp315_linux_x86_64", "cp315_windows_x86_64"],
                 whls = [],
             ),
         ],