Dependency features not installed in manifest mode

[AlexAltea]

It seems that features in the array of dependencies of vcpkg.json files get ignored by vcpkg install.

Environment

• OS: Any?
• Compiler: Any?

To reproduce

Steps to reproduce the behavior:

1. Create an empty folder with the following vcpkg.json file:

   {
     "name": "xxx",
     "version-string": "0.1.0",
     "dependencies": [
       {
         "name": "capstone",
         "features": [ "x86" ]
       }
     ]
   }
   

2. Run vcpkg install in that folder.
3. capstone[core] is installed instead of capstone[x86].
   See: https://github.com/microsoft/vcpkg/blob/master/ports/capstone/CONTROL

Expected behavior

capstone[x86] should have been installed.

[AlexAltea]

CC @strega-nil

[strega-nil]

I will look into this, it's likely to do with the same thing as #12186