Define CLONE_NEWCGROUP
Currently restricted to non-Android Linux. In theory this should work on
Android as well (since it's a function of the kernel ABI), but the
released version of the NDK doesn't export it, so putting it in
`notbsd/mod.rs` makes Travis very unhappy.
diff --git a/src/unix/notbsd/linux/mod.rs b/src/unix/notbsd/linux/mod.rs
index daf5641..46ed807 100644
--- a/src/unix/notbsd/linux/mod.rs
+++ b/src/unix/notbsd/linux/mod.rs
@@ -248,6 +248,8 @@
pub const ABMON_11: ::nl_item = 0x20018;
pub const ABMON_12: ::nl_item = 0x20019;
+pub const CLONE_NEWCGROUP: ::c_int = 0x02000000;
+
pub const MON_1: ::nl_item = 0x2001A;
pub const MON_2: ::nl_item = 0x2001B;
pub const MON_3: ::nl_item = 0x2001C;