Fix download of Windows Python toolchain on Linux (#769)

python/repositories.bzl

diff --git a/python/repositories.bzl b/python/repositories.bzl
index 8bb8a9c..30c2841 100644
--- a/python/repositories.bzl
+++ b/python/repositories.bzl
@@ -110,7 +110,8 @@
     # Make the Python installation read-only.
     if not rctx.attr.ignore_root_user_error:
         if "windows" not in rctx.os.name:
-            exec_result = rctx.execute(["chmod", "-R", "ugo-w", "lib"])
+            lib_dir = "lib" if "windows" not in platform else "Lib"
+            exec_result = rctx.execute(["chmod", "-R", "ugo-w", lib_dir])
             if exec_result.return_code != 0:
                 fail_msg = "Failed to make interpreter installation read-only. 'chmod' error msg: {}".format(
                     exec_result.stderr,
@@ -131,6 +132,29 @@
 
     python_bin = "python.exe" if ("windows" in platform) else "bin/python3"
 
+    if "windows" in platform:
+        glob_include = [
+            "*.exe",
+            "*.dll",
+            "bin/**",
+            "DLLs/**",
+            "extensions/**",
+            "include/**",
+            "Lib/**",
+            "libs/**",
+            "Scripts/**",
+            "share/**",
+        ]
+    else:
+        glob_include = [
+            "bin/**",
+            "extensions/**",
+            "include/**",
+            "lib/**",
+            "libs/**",
+            "share/**",
+        ]
+
     build_content = """\
 # Generated by python/repositories.bzl
 
@@ -141,18 +165,7 @@
 filegroup(
     name = "files",
     srcs = glob(
-        include = [
-            "*.exe",
-            "*.dll",
-            "bin/**",
-            "DLLs/**",
-            "extensions/**",
-            "include/**",
-            "lib/**",
-            "libs/**",
-            "Scripts/**",
-            "share/**",
-        ],
+        include = {glob_include},
         # Platform-agnostic filegroup can't match on all patterns.
         allow_empty = True,
         exclude = [
@@ -206,6 +219,7 @@
     py3_runtime = ":py3_runtime",
 )
 """.format(
+        glob_include = repr(glob_include),
         python_path = python_bin,
         python_version = python_short_version,
     )