Autogenerate BUILD files

vendor/github.com/coreos/pkg/capnslog/BUILD

@@ -18,7 +18,12 @@ go_library(
         "logmap.go",
         "pkg_logger.go",
         "syslog_formatter.go",
-    ],
+    ] + select({
+        "@io_bazel_rules_go//go/platform:windows_amd64": [
+            "init_windows.go",
+        ],
+        "//conditions:default": [],
+    }),
     tags = ["automanaged"],
     deps = ["//vendor/github.com/coreos/go-systemd/journal:go_default_library"],
 )

vendor/github.com/coreos/pkg/dlopen/BUILD

@@ -25,8 +25,16 @@ cgo_genrule(
 
 go_library(
     name = "go_default_library",
-    srcs = [],
-    library = ":cgo_codegen",
+    srcs = [
+        "dlopen.go",
+    ] + select({
+        "@io_bazel_rules_go//go/platform:linux_amd64": [
+            "dlopen_example.go",
+        ],
+        "//conditions:default": [],
+    }),
+    cgo = True,
+    clinkopts = ["-ldl"],
     tags = ["automanaged"],
 )