Add contrib/mariadbclient#469

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hfcrwx wants to merge 6 commits intochenshuo:masterfrom

hfcrwx:mariadb-client

Commits on May 29, 2020

Add contrib/mariadbclient
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Commits on May 30, 2020

Update .travis.yml & build.sh
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Commits on May 31, 2020

Commits on Jun 25, 2020

zero copy MYSQL_RES
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Commits on May 18, 2021

Update CMakeLists.txt & .travis.yml
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