Updates for bazel on windows.

opengl/BUILD

@@ -0,0 +1,18 @@
+load("@rules_cc//cc:defs.bzl", "cc_library")
+
+cc_library(
+    name = "window",
+    srcs = ["window.cpp"],
+    hdrs = ["window.h"],
+    visibility = ["//visibility:public"],
+    deps = ["//:window"],
+)
+
+cc_test(
+    name = "window_test",
+    srcs = ["window_test.cpp"],
+    deps = [
+        ":window",
+        "@TinyTest//:tinytest",
+    ],
+)