Fix cargo build for rust-csv
diff --git a/third_party/rust-csv/csv-index/Cargo.toml b/third_party/rust-csv/csv-index/Cargo.toml
index f145046..285f222 100644
--- a/third_party/rust-csv/csv-index/Cargo.toml
+++ b/third_party/rust-csv/csv-index/Cargo.toml
@@ -18,6 +18,9 @@
[lib]
bench = false
+[target.'cfg(not(target_env = "sgx"))'.dependencies]
+sgx_tstd = { path = "../../../sgx_tstd" }
+
[dependencies]
byteorder = { path = "../../byteorder", version = "1" }
csv = { path = "..", version = "1.0.0-beta.5" }