Problem with installing required dependency_links in projects with pyproject.toml's.

[AraHaan]

Problem description

When I was unable to install my original project without pyproject.toml I had to create that file, now it's impossible to have it automatically install all the url form of dependencies as well that are required to even use that code.

https://github.com/DecoraterBot-devs/DecoraterBotUtils has this issue, Also I am a bit upset that I can't:

• specify files that will build into extension modules in the toml file.
• specify these dependency links with the other dependencies in the toml file (using the same format of strings from requirements.txt).

As such this feels like an outright downgrade compared to the old setup.py install and I feel needs to be corrected at the source.