Windows build doesn't work with default cpprestsdk build

[garethsb]

The example app builds and starts but the HTTP endpoints are inaccessible.

Where the instructions have this:

conan install src `
  -g CMakeToolchain `
  --settings:all build_type=<Release-or-Debug> `
  --build=missing `
  --output-folder=src/conan

The workaround is adding the following extra options for cpprestsdk and forcing nmos-cpp to rebuild:

conan install src `
  -g CMakeToolchain `
  --settings:all build_type=<Release-or-Debug> `
  --options:all cpprestsdk/*:http_client_impl=asio `
  --options:all cpprestsdk/*:http_listener_impl=asio `
  --build=nmos-cpp/* `
  --build=missing `
  --output-folder=src/conan

This needs to be repeated for both build_type=Debug and build_type=Release.
Then rebuild NvNmos.
If you run nvnmos-example with final command line arg -40 (most verbose logging level) you’ll see "Build settings" are output as one of the first log messages which confirm which HTTP implementation is being used.

However, nmos-cpp certainly used to work with the default WinHTTP/HTTP.SYS implementation, just possibly requiring running as administrator so that listening on the wildcard address is permitted, so it'd be good to understand what's changed.