HUE-8737 [core] Fix Python 3.8.0 on Ubuntu pathes in makefile

Review Request #14570 — Created Dec. 4, 2019 and updated

yingc
hue
master
HUE-8737
hue
jgauthier, johan, ranade, romain, weixia
commit 8594aa46a5f17f5c1d08aec857f76e4f57121f25
Author: Ying Chen <yingchen@cloudera.com>
Date:   Wed Dec 4 13:57:41 2019 -0800

    HUE-8737 [core] Fix Python 3.8.0 on Ubuntu pathes in makefile

:100644 100644 fb0e7aa3.. dc460fd... M	Makefile.vars
Default configuration put python3.8 as following and then able to run make app

yingchen@dell:/opt/Python-3.8.0$ which python3.8
/usr/local/bin/python3.8
yingchen@dell:/opt/Python-3.8.0$ find / -name Python.h 2> /dev/null | grep 3.8
/usr/local/include/python3.8/Python.h
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