Bazel: Add rt target.

cyber/BUILD

@@ -62,7 +62,6 @@ cc_library(
     hdrs = ["cyber.h"],
     linkopts = [
         "-lprotobuf",
-        "-lrt",
     ],
     deps = [
         "//cyber:binary",
@@ -104,6 +103,7 @@ cc_library(
         "//cyber/transport",
         "//cyber/transport:participant",
         "//cyber/transport:sub_listener",
+        "//third_party:rt",
         "//third_party:uuid",
         "//third_party/tf2",
         "@fastrtps",

modules/perception/inference/paddlepaddle/BUILD

@@ -9,8 +9,6 @@ cc_library(
     linkopts = [
         "-lsnappy",
         "-lz",
-        "-lsnappy",
-        "-lrt",
         "-ldl",
         "-lpthread",
     ],
@@ -18,6 +16,7 @@ cc_library(
         "//cyber/common:log",
         "//external:gflags",
         "//modules/perception/inference:inference_lib",
+        "//third_party:rt",
         "@boost",
         "@com_google_protobuf//:protobuf",
         "@cuda",

third_party/BUILD

@@ -4,3 +4,8 @@ cc_library(
     name = "uuid",
     linkopts = ["-luuid"],
 )
+
+cc_library(
+    name = "rt",
+    linkopts = ["-lrt"],
+)