chore: replace is_windows select pattern with target_platform_has_constraint pattern

[gregmagolan]

Based on https://github.com/bazelbuild/proposals/blob/main/designs/2019-11-11-target-platform-constraints.md#proposal-a-check-method-that-takes-a-constraint-value-label
Flag added in bazel 2.1.0 https://docs.bazel.build/versions/main/skylark/lib/ctx.html#target_platform_has_constraint

[alexeagle]

Saw this go by on Bazel slack:

Chad McElligott
How do I see what os and cpu platform bazel detects for my system?
I am trying to update a custom toolchain to support arm macos and want to verify that i'm specifying the platform identifiers correctly

Cristian Hancila
bazel query @local_config_platform//... --output=build (edited)
there's also constraints.bzl in that same package with HOST_CONSTRAINTS variable

# DO NOT EDIT: automatically generated constraints list for local_config_platform
# Auto-detected host platform constraints.
HOST_CONSTRAINTS = [
  '@platforms//cpu:aarch64',
  '@platforms//os:osx',
]