21d8619 Update cmake build to use C++20 standard.

Authored and Committed by filbranden 3 months ago
    Update cmake build to use C++20 standard.
    
    GCC 11 includes support for C++ coroutines, but it needs to use C++20
    standard for that to be enabled.
    
    https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=29f0e90d9904d8e0965443d4da4c95ddde5edb1e
    
    Thrift type "stream" requires support for coroutines through Folly, so
    let's bump C++ standard to C++20 in order to enable it.
    
    Signed-off-by: Filipe Brandenburger <filbranden@gmail.com>
    
        
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