Can not compile using bazel without --copt=-DENABLE_TEST

[owent]

Describe your environment

OS: Linux
Compiler: GCC 9
Build system: bazel

Steps to reproduce

bazel build ... --copt=-DENABLE_TEST --copt=-DENABLE_ASYNC_EXPORT

What is the expected behavior?
Build success.

What is the actual behavior?

/data/home/workspace/testopentelemetry/opentelemetry-cpp/ext/test/http/BUILD:4:8: Compiling ext/test/http/curl_http_test.cc failed: (Exit 1): gcc failed: error executing command /usr/local/gcc-9.4.0/bin/gcc -U_FORTIFY_SOURCE -fstack-protector -Wall -Wunused-but-set-parameter -Wno-free-nonheap-object -fno-omit-frame-pointer '-std=c++0x' -MD -MF ... (remaining 63 arguments skipped)

Use --sandbox_debug to see verbose messages from the sandbox and retain the sandbox build root for debugging
ext/test/http/curl_http_test.cc: In member function 'virtual void BasicCurlHttpTests_SendGetRequestAsync_Test::TestBody()':
ext/test/http/curl_http_test.cc:417:17: error: 'class opentelemetry::v1::ext::http::client::curl::HttpClient' has no member named 'WaitBackgroundThreadExit'
  417 |     http_client.WaitBackgroundThreadExit();
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~
ext/test/http/curl_http_test.cc: In member function 'virtual void BasicCurlHttpTests_SendPostRequestAsync_Test::TestBody()':
ext/test/http/curl_http_test.cc:490:17: error: 'class opentelemetry::v1::ext::http::client::curl::HttpClient' has no member named 'WaitBackgroundThreadExit'
  490 |     http_client.WaitBackgroundThreadExit();
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~
ext/test/http/curl_http_test.cc: In member function 'virtual void BasicCurlHttpTests_FinishInAsyncCallback_Test::TestBody()':
ext/test/http/curl_http_test.cc:519:17: error: 'class opentelemetry::v1::ext::http::client::curl::HttpClient' has no member named 'WaitBackgroundThreadExit'
  519 |     http_client.WaitBackgroundThreadExit();
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~
INFO: Elapsed time: 301.171s, Critical Path: 50.79s
INFO: 2683 processes: 371 internal, 2312 linux-sandbox.
FAILED: Build did NOT complete successfully