While upstream pistache has not yet released a stable 'tag'
a lot has changed since June 2020:
* project has moved to meson build system, cmake builds
do not install headers.
* patches in buildroot are no longer required
* project-implemented Pistache::Optional was replaced by
use of std::optional. This is only available in C++17
* dependency to rapidjson has been introduced
Signed-off-by: Thomas Ruschival <thomas@ruschival.de>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
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