Move dependency on libdl into build defs, like CMake

PiperOrigin-RevId: 281699435
Change-Id: Iced13e98578b2c36a1eeac71fd02a6d7ed87a8fb

sandboxed_api/BUILD.bazel

@@ -161,10 +161,6 @@ cc_library(
     name = "client",
     srcs = ["client.cc"],
     copts = sapi_platform_copts(),
-    # TODO(124852776): investigate whether this is necessary
-    linkopts = [
-        "-Wl,-ldl",
-    ],
     visibility = ["//visibility:public"],
     deps = [
         ":call",

sandboxed_api/bazel/sapi.bzl

@@ -205,9 +205,12 @@ def sapi_library(
     native.cc_binary(
         name = name + ".bin",
         linkopts = [
-            # The sandboxing client must have access to all
-            "-Wl,-E",  # symbols used in the sandboxed library, so these
-        ] + exported_funcs,  # must be both referenced, and exported
+            "-ldl",  # For dlopen(), dlsym()
+            # The sandboxing client must have access to all symbols used in
+            # the sandboxed library, so these must be both referenced, and
+            # exported
+            "-Wl,-E",
+        ] + exported_funcs,
         deps = [
             ":" + name + ".lib",
             rprefix + "//sandboxed_api:client",
@@ -217,9 +220,7 @@ def sapi_library(
 
     native.cc_library(
         name = name + ".lib",
-        deps = [
-            lib,
-        ],
+        deps = [lib],
         alwayslink = 1,  # All functions are linked into depending binaries
         **common
     )