Run CMSG tests on s390x and sparc64

Closes rust-lang#1239.
Closes rust-lang#1240.

Author: gnzlbg

ci/test-runner-linux

@@ -5,15 +5,6 @@ set -e
 arch=$1
 prog=$2
 
-# Skip cmsg test on linux-s390x
-# https://github.com/rust-lang/libc/issues/1240
-if [ "$arch" = "s390x" ]; then
-	progbasename=`basename $prog`
-	if [ "${progbasename%%-*}" = "cmsg" ]; then
-		exit 0
-	fi
-fi
-
 cd /qemu/init
 echo "#!/bin/sh\n/prog --color=never" > run_prog.sh
 chmod +x run_prog.sh

libc-test/test/cmsg.rs

@@ -52,9 +52,6 @@ mod t {
         }
     }
 
-    // Skip on sparc64
-    // https://github.com/rust-lang/libc/issues/1239
-    #[cfg(not(target_arch = "sparc64"))]
     #[test]
     fn test_cmsg_nxthdr() {
         use std::ptr;