Remove build.rs and nu-build (#2282)

crates/nu_plugin_start/Cargo.toml

@@ -19,6 +19,5 @@ open = "1.4.0"
 url = "2.1.1"
 
 [build-dependencies]
-nu-build = {version = "0.17.0", path = "../nu-build"}
 nu-errors = {version = "0.17.0", path = "../nu-errors"}
 nu-source = {version = "0.17.0", path = "../nu-source"}

crates/nu_plugin_start/build.rs

@@ -1,3 +0,0 @@
-fn main() -> Result<(), Box<dyn std::error::Error>> {
-    nu_build::build()
-}