bootstrap: Don't bundle musl on Unikraft

Signed-off-by: Martin Kröning <martin.kroening@eonerc.rwth-aachen.de>

src/bootstrap/compile.rs

@@ -261,7 +261,7 @@ fn copy_self_contained_objects(
     // to using gcc from a glibc-targeting toolchain for linking.
     // To do that we have to distribute musl startup objects as a part of Rust toolchain
     // and link with them manually in the self-contained mode.
-    if target.contains("musl") {
+    if target.contains("musl") && !target.contains("unikraft") {
         let srcdir = builder.musl_libdir(target).unwrap_or_else(|| {
             panic!("Target {:?} does not have a \"musl-libdir\" key", target.triple)
         });

src/bootstrap/sanity.rs

@@ -206,7 +206,7 @@ than building it.
         }
 
         // Make sure musl-root is valid
-        if target.contains("musl") {
+        if target.contains("musl") && !target.contains("unikraft") {
             // If this is a native target (host is also musl) and no musl-root is given,
             // fall back to the system toolchain in /usr before giving up
             if build.musl_root(*target).is_none() && build.config.build == *target {