std: make fortanix-sgx-abi a public depedenceny

It's exported publicly, so it should not be linted.

Author: notriddle

library/std/Cargo.toml

@@ -42,7 +42,7 @@ rand_xorshift = "0.3.0"
 dlmalloc = { version = "0.2.3", features = ['rustc-dep-of-std'] }
 
 [target.x86_64-fortanix-unknown-sgx.dependencies]
-fortanix-sgx-abi = { version = "0.5.0", features = ['rustc-dep-of-std'] }
+fortanix-sgx-abi = { version = "0.5.0", features = ['rustc-dep-of-std'], public = true }
 
 [target.'cfg(target_os = "hermit")'.dependencies]
 hermit-abi = { version = "0.3.0", features = ['rustc-dep-of-std'] }