feat: use kernel's default features

hermit/Cargo.toml

diff --git a/hermit/Cargo.toml b/hermit/Cargo.toml
index ab0f47a..dfd8597 100644
--- a/hermit/Cargo.toml
+++ b/hermit/Cargo.toml
@@ -22,19 +22,7 @@
 talc = { version = "4.4", default-features = false, features = ["lock_api"], optional = true  }
 
 [features]
-default = [
-    "acpi",
-    "dhcpv4",
-    "dns",
-    "fsgsbase",
-    "kernel-stack",
-    "pci-ids",
-    "pci",
-    "smp",
-    "tcp",
-    "udp",
-    "virtio-fs",
-]
+default = []
 common-os = ["hermit-abi", "generic_once_cell", "libm", "spinning_top", "take-static", "talc"]
 
 ## Links against libc.a.

hermit/build.rs

diff --git a/hermit/build.rs b/hermit/build.rs
index fae89a6..09035c7 100644
--- a/hermit/build.rs
+++ b/hermit/build.rs
@@ -104,6 +104,7 @@
 		forward_features(
 			&mut cargo,
 			[
+				"default",
 				"common-os",
 				"mman",
 				"newlib",