[SUBMODULE] update dmlc-core and Test (#387)

* [SUBMODULE] update dmlc-core

* [TEST] Not keep ROCM link but only verifies it

Jenkinsfile

@@ -91,8 +91,6 @@ stage('Build') {
            echo LLVM_CONFIG=llvm-config-4.0 >> config.mk
            echo USE_RPC=1 >> config.mk
            echo USE_BLAS=openblas >> config.mk
-           echo USE_ROCM=1 >> config.mk
-           echo ROCM_PATH=/opt/rocm >> config.mk
            """
         make('gpu', '-j2')
         sh "mv lib/libtvm.so lib/libtvm_llvm40.so"
@@ -103,6 +101,11 @@ stage('Build') {
         make('gpu', '-j2')
         sh "mv lib/libtvm.so lib/libtvm_llvm60.so"
         pack_lib('gpu', tvm_multilib)
+        sh """
+           echo USE_ROCM=1 >> config.mk
+           echo ROCM_PATH=/opt/rocm >> config.mk
+           """
+        make('gpu', '-j2')
       }
     }
   },

dmlc-core @ 87a0c162

-Subproject commit 7afa45b87ce639b29d809cc15149f0caa48ac6c4
+Subproject commit 87a0c16267f94155957e527ac362269e5bb33f0e