Merge #388

388: add BSD socket layer r=stlankes a=stlankes

The new BSD socket layer depends on hermitcore/libhermit-rs#633 and a revised version of `std`. `std` is part of the [rust](/hermitcore/rust/tree/socket) fork. Note: If you use this version, please modify `Cargo.toml`.  [`hermit-abi`](https://github.com/hermitcore/rust/blob/socket/library/std/Cargo.toml#L45

) must point to the version of this PR.    

Co-authored-by: Stefan Lankes <slankes@eonerc.rwth-aachen.de>

hermit-abi/Cargo.toml

 [package]
 name = "hermit-abi"
-version = "0.2.6"
+version = "0.3.0"
 authors = ["Stefan Lankes"]
 license = "MIT OR Apache-2.0"
 readme = "README.md"

hermit-sys/build.rs

@@ -101,7 +101,7 @@ impl KernelSrc {
 		forward_features(
 			&mut cmd,
 			[
-				"acpi", "dhcpv4", "fsgsbase", "pci", "pci-ids", "smp", "tcp", "vga",
+				"acpi", "dhcpv4", "fsgsbase", "pci", "pci-ids", "smp", "tcp", "trace", "vga",
 			]
 			.into_iter(),
 		);

libhermit-rs @ 99d90dad

-Subproject commit 1990f0d2211a2e27563d971c938173973a46d46a
+Subproject commit 99d90dad95e967af053dd6d645b84b89879f5b60