Remove --target bail

Author: fee1-dead

src/cargo/core/compiler/build_config.rs

@@ -84,11 +84,6 @@ impl BuildConfig {
             anyhow::bail!("jobs may not be 0");
         }
 
-        if config.cli_unstable().build_std.is_some() && requested_kinds[0].is_host() {
-            // TODO: This should eventually be fixed.
-            anyhow::bail!("-Zbuild-std requires --target");
-        }
-
         Ok(BuildConfig {
             requested_kinds,
             jobs,