Add alias in bazel_tools for jni_md_header-windows

Some projects, eg. TF depends on @bazel_tools//tools/jdk:jni_md_header-<platform>
https://github.com/tensorflow/tensorflow/blob/master/tensorflow/java/src/main/native/BUILD#L70

We already have this for darwin, linux and freebsd, should also provide it for Windows.

RELNOTES: None.
PiperOrigin-RevId: 160248449
diff --git a/tools/jdk/BUILD b/tools/jdk/BUILD
index d526810..51bcdfe 100644
--- a/tools/jdk/BUILD
+++ b/tools/jdk/BUILD
@@ -36,6 +36,11 @@
 )
 
 alias(
+    name = "jni_md_header-windows",
+    actual = "@local_jdk//:jni_md_header-windows",
+)
+
+alias(
     name = "jni_md_header-freebsd",
     actual = "@local_jdk//:jni_md_header-freebsd",
 )