Use the newer libc + nix proposed patches

.cargo/config

 paths = [
     "patches/atty",
-    "patches/liblibc",
+    "patches/libc",
     "patches/mio",
+    "patches/nix",
     "patches/tokio/tokio",
     "patches/tokio/tokio-reactor",
     "patches/net2-rs",

.gitmodules

@@ -48,3 +48,11 @@
 [submodule "patches/tokio"]
 	path = patches/tokio
 	url = https://gitlab.redox-os.org/redox-os/tokio.git
+[submodule "patches/libc"]
+	path = patches/libc
+	url = https://github.com/AdminXVII/libc
+	branch = extra-traits-redox
+[submodule "patches/nix"]
+	path = patches/nix
+	url = https://github.com/AdminXVII/nix
+	branch = add-redox-support

libc @ f6c0ead0

+Subproject commit f6c0ead0279077dd9bda305e6c9d3ba3267390b2

liblibc @ eb75c489

-Subproject commit eb75c489172e10bfcb57ca679ff337827cf783a9

nix @ 6fd64569

+Subproject commit 6fd64569452536e9759c45c8f4511e6c983196f3