_Compilie Testing issues_

Branch: dpdk-next-net

0ab71e775d1f79a1a8d625b16be2cb53f7263ac5 --> compile testing fail

Test environment and result as below:

+--------------+-------------------+------------------+--------------+
| Environment  | dpdk_compile_spdk | dpdk_compile_ovs | dpdk_compile |
+==============+===================+==================+==============+
| Ubuntu 18.04 | FAIL              | PASS             | PASS         |
+--------------+-------------------+------------------+--------------+
| FreeBSD 11.2 | PASS              | SKIPPED          | PASS         |
+--------------+-------------------+------------------+--------------+
| CentOS 8     | SKIPPED           | PASS             | PASS         |
+--------------+-------------------+------------------+--------------+

Ubuntu 18.04
	Kernel: 4.15.0-generic
	GCC: 7.4

FreeBSD 11.2
	Kernel: 11.2
	GCC: 8.3

CentOS 8
	Kernel: 4.18.0.el8_0
	GCC: 8.2

https://lab.dpdk.org/results/dashboard/tarballs/7335/

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