Auto merge of #955 - afck:master, r=alexcrichton

Add MCL_CURRENT and MCL_FUTURE to s390.
diff --git a/src/unix/notbsd/linux/s390x.rs b/src/unix/notbsd/linux/s390x.rs
index d7ed383..103abcc 100644
--- a/src/unix/notbsd/linux/s390x.rs
+++ b/src/unix/notbsd/linux/s390x.rs
@@ -735,6 +735,9 @@
 pub const PTRACE_LISTEN: ::c_uint = 0x4208;
 pub const PTRACE_PEEKSIGINFO: ::c_uint = 0x4209;
 
+pub const MCL_CURRENT: ::c_int = 0x0001;
+pub const MCL_FUTURE: ::c_int = 0x0002;
+
 pub const EPOLLWAKEUP: ::c_int = 0x20000000;
 
 pub const MAP_HUGETLB: ::c_int = 0x040000;