By default use IPC to compile

Author: Xanewok

Cargo.toml

@@ -80,4 +80,4 @@ rustc_tools_util = "0.2"
 [features]
 clippy = ["clippy_lints", "rls-rustc/clippy"]
 ipc = ["tokio", "futures", "rls-rustc/ipc", "rls-ipc/server"]
-default = []
+default = ["ipc"]

azure-pipelines.yml

@@ -40,5 +40,5 @@ jobs:
       ".":
         - test_name: test_tooltip_std
           test_args: --ignored
-      # Test also the IPC feature build
-        - args: --features ipc
+      # Test that we don't regress in-process compilation build
+        - args: --no-default-features