Replace host_windows condition with @platforms//os:windows

Bazel 8 emits warnings for deprecated bazel_tools condition targets such
as @bazel_tools//src/conditions:host_windows_x64_constraint.

rules_nodejs still uses @bazel_tools//src/conditions:host_windows in a
few widely used rules (e.g. js_library, npm_link, pkg_npm), causing
consumers to see large numbers of warnings from generated npm targets.

Replace these host Windows checks with @platforms//os:windows in the
affected user-facing rules. This is a minimal change to eliminate the
Bazel 8 warning flood without attempting a full migration of all
bazel_tools condition usages.

Architecture-specific and toolchain-selection cases are intentionally
left unchanged, as they require a more careful migration.

Fixes Bazel 8 warnings reported in #2440

Author: davido

internal/common/copy_to_bin.bzl

@@ -58,7 +58,7 @@ def copy_to_bin(name, srcs, **kwargs):
         name = name,
         srcs = srcs,
         is_windows = select({
-            "@bazel_tools//src/conditions:host_windows": True,
+            "@platforms//os:windows": True,
             "//conditions:default": False,
         }),
         **kwargs

internal/common/params_file.bzl

@@ -125,7 +125,7 @@ def params_file(
         data = data,
         newline = newline or "auto",
         is_windows = select({
-            "@bazel_tools//src/conditions:host_windows": True,
+            "@platforms//os:windows": True,
             "//conditions:default": False,
         }),
         **kwargs

internal/js_library/js_library.bzl

@@ -417,7 +417,7 @@ def js_library(
         # TODO: remove once legacy module_mapping is removed
         module_name = package_name if package_name != "$node_modules$" else None,
         is_windows = select({
-            "@bazel_tools//src/conditions:host_windows": True,
+            "@platforms//os:windows": True,
             "//conditions:default": False,
         }),
         **kwargs

internal/linker/npm_link.bzl

@@ -151,7 +151,7 @@ set to the target's package & the files provided from the targets DefaultInfo.
         package_name = package_name,
         package_path = package_path,
         is_windows = select({
-            "@bazel_tools//src/conditions:host_windows": True,
+            "@platforms//os:windows": True,
             "//conditions:default": False,
         }),
         **kwargs

internal/pkg_npm/pkg_npm.bzl

@@ -376,15 +376,15 @@ def pkg_npm_macro(name, tgz = None, **kwargs):
     native.alias(
         name = name + ".pack",
         actual = select({
-            "@bazel_tools//src/conditions:host_windows": name + ".pack.bat",
+            "@platforms//os:windows": name + ".pack.bat",
             "//conditions:default": name + ".pack.sh",
         }),
     )
 
     native.alias(
         name = name + ".publish",
         actual = select({
-            "@bazel_tools//src/conditions:host_windows": name + ".publish.bat",
+            "@platforms//os:windows": name + ".publish.bat",
             "//conditions:default": name + ".publish.sh",
         }),
     )

third_party/github.com/bazelbuild/bazel-skylib/rules/private/copy_file_private.bzl

@@ -203,7 +203,7 @@ def copy_file(name, src, out, is_directory = False, is_executable = False, allow
         src = src,
         out = out,
         is_windows = select({
-            "@bazel_tools//src/conditions:host_windows": True,
+            "@platforms//os:windows": True,
             "//conditions:default": False,
         }),
         is_executable = is_executable,