hermit: Add virtio-net feature

hermit-os/kernel#1825 makes virtio-net an
optional feature.

Signed-off-by: Jens Reidel <[email protected]>

Author: Gelbpunkt

hermit/Cargo.toml

@@ -66,6 +66,7 @@ tcp = []
 trace = []
 udp = []
 vga = []
+virtio-net = []
 vsock = []
 common-os = ["hermit-abi", "generic_once_cell", "libm", "spinning_top", "take-static", "talc"]
 

hermit/build.rs

@@ -133,6 +133,7 @@ impl KernelSrc {
 				"trace",
 				"udp",
 				"vga",
+				"virtio-net",
 				"vsock",
 			]
 			.into_iter(),