Pass location of kernel's Cargo.toml to bootloader

Author: 64

src/builder.rs

@@ -232,6 +232,7 @@ impl Builder {
             cmd.arg("--target").arg(&bootloader_target);
             cmd.arg("--release");
             cmd.env("KERNEL", kernel_bin_path);
+            cmd.env("KERNEL_MANIFEST", &self.kernel_manifest_path);
             cmd.env_remove("RUSTFLAGS");
             cmd.env("XBUILD_SYSROOT_PATH", target_dir.join("bootloader-sysroot")); // for cargo-xbuild
             cmd