Remove target from bazel testing
diff --git a/kokoro/linux/bazel_distcheck/build.sh b/kokoro/linux/bazel_distcheck/build.sh
index 7c8c539..a50b175 100755
--- a/kokoro/linux/bazel_distcheck/build.sh
+++ b/kokoro/linux/bazel_distcheck/build.sh
@@ -55,6 +55,7 @@
   --
   //...
   -//objectivec/...  # only works on macOS
+  -//csharp/...      # release builds require external dependencies
   @com_google_protobuf_examples//...
 )
 ${SCRIPT_ROOT}/kokoro/common/bazel_wrapper.sh "${bazel_args[@]}"