Remove relay_fb cargo setup

Reviewed By: shayne-fletcher

Differential Revision: D51477502

fbshipit-source-id: cc3033a5f6c94b887aee917d8974cf6c75799576

Author: zertosh

compiler/.cargo/config.toml

@@ -0,0 +1,8 @@
+# This file should be kept in sync with the project's Buck flags.
+# See parent PACKAGE.
+
+[build]
+rustflags = [
+    "-Drust-2018-idioms",
+    "-Dwarnings",
+]

compiler/crates/fixture-tests/src/lib.rs

@@ -47,8 +47,6 @@
 //! *FB-internal: see `scripts/generate_fixture_tests.sh` to generate all.*
 //
 //! *FB-internal: use buck run //relay/oss/crates/fixture-tests:fixture-tests-bin -- <path to tests dir>
-//! *FB-internal: if you don't want to use cargo run. This is useful for development on a dev-server or
-//! *FB-internal: or machines w/o cargo installed.
 
 mod print_diff;