* [boost] update generator script for boost 1.76

* [boost] update ports to 1.76.0 (run generator)

* [boost] fix windows build?

* [quantlib] update and fix mac build

* [symengine] update and fix build

* [avro-cpp] update to latest master and fix windows build

* [folly] update to 2021.05.31.00

* [fbthrift, fizz, wangle] update to v2021.05.31.00 and fix build

* [proxygen] update to version 2021.05.31.00

* [fizz, proxygen, fbthrift] fix sodium target

* [proxygen] also works on macOS

* [quantlib] use fix from upstream to fix mac build

* [symengine] minimize patch file and fix deprecation warning

* [folly,proxygen,wangle,fizz,fbthrift] update to 2021.06.14.00

* [fbthrift] remove unnecessary dependency rsocket

I couldn't find any information that this dependency exists. The term is used in the code, but not in the context of a dependency

* [fizz,fbthrift] fix zlib dependency

* [fbthrift] pass required flex executable to cmake configure

* add version files

* [boost] generate-ports.ps1: Apply code review

* [boost] changes from new version of generate-ports script

* update version files

* [boost] generate-ports.ps1: Apply code review

Co-authored-by: Robert Schumacher <roschuma@microsoft.com>

* [boost] update to 1.73

* [ompl] remove dependency to boost-disjoint-sets

* [libtorrent] include fixes from RC_1_2 branch

* [liblas] fix boost headers

* [freeopcua] fix std headers

* [pcl] fix build with Boost 1.73.0

* [hpx] fix build with Boost 1.73.0

* [libmysql] fix conflict with C++20 header <version>

* [boost-modular-build-helper] move port-specific b2 options to the file `<port_dir>/b2-options.cmake`
[boost-python] support Python2 (fixes #3495)

* [boost-python] remove Python executable from user-config

* [libtorrent] update version after merge

* [libtorrent] add boost-variant dependency