Autogenerate BUILD files

vendor/golang.org/x/sys/windows/BUILD

@@ -9,7 +9,29 @@ load(
 
 go_library(
     name = "go_default_library",
-    srcs = ["mksyscall.go"],
+    srcs = [
+        "mksyscall.go",
+    ] + select({
+        "@io_bazel_rules_go//go/platform:windows_amd64": [
+            "asm_windows_amd64.s",
+            "dll_windows.go",
+            "env_unset.go",
+            "env_windows.go",
+            "eventlog.go",
+            "exec_windows.go",
+            "memory_windows.go",
+            "race0.go",
+            "security_windows.go",
+            "service.go",
+            "str.go",
+            "syscall.go",
+            "syscall_windows.go",
+            "zsyscall_windows.go",
+            "ztypes_windows.go",
+            "ztypes_windows_amd64.go",
+        ],
+        "//conditions:default": [],
+    }),
     tags = ["automanaged"],
 )