_Compilie Testing issues_

Branch: dpdk-next-net

ba465d0cf8672032e0339cda7ef3a083b2d8a2af --> compile testing fail

Test environment and result as below:

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

FreeBSD 11.2
	Kernel: 11.2
	GCC: 8.3

Ubuntu 18.04
	Kernel: 4.15.0-generic
	GCC: 7.4

CentOS 8
	Kernel: 4.18.0.el8_0
	GCC: 8.2

https://lab.dpdk.org/results/dashboard/tarballs/7027/

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