Build perconaft with gcc-10 on ubuntu 20.04.#445

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prohaska7 wants to merge 2 commits intopercona:masterfrom

prohaska7:may2020-gcc-10-builds

Commits on Apr 11, 2020

glibc 2.30 defines the gettid system call, which conflicts with the
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Commits on May 22, 2020

Build with gcc-10.0.1 (unbuntu 20.04). When cmake is probing for language specific flag support
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