_Compilie Testing issues_

Branch: dpdk-next-net-mlx

685e0fbc4709ee94b17f5315cdf12fb942675423 --> compile testing fail

Test environment and result as below:

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

Ubuntu 18.04
	Kernel: 4.15.0-generic
	GCC: 7.4

CentOS 8
	Kernel: 4.18.0.el8_0
	GCC: 8.2

FreeBSD 11.2
	Kernel: 11.2
	GCC: 8.3

https://lab.dpdk.org/results/dashboard/tarballs/7026/

UNH-IOL DPDK Performance Test Lab

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