Manifest mode: host: true should not imply default features

[autoantwort]

Imagine I have the following ports:

{ "name": "start",
   "dependencies": [{"name": "one", "host": true}, "three"]
}
{ "name": "one",
   "dependencies": ["two"],
   "default-features": ["foo"],
   "features": {"foo": {}} 
}
{ "name": "two",
   "dependencies": ["three"],
   "default-features": ["bar"],
   "features": {"bar": {}} 
}
{ "name": "three",
   "default-features": ["super"],
   "features": {"super": {}} 
}

I suggest that if I install start with triplet=host-triplet that start[core], one[core], two[core], three[core, super] will be installed. Currently start[core], one[core,foo], two[core,bar], three[core, super] is installed. The reasoning host dependencies are mainly (only?) used for tools that are needed to build for the target triplet, so the ports only needs this functionality and nothing more. For example qtbase has a host dependency on itself for the qmake tool, so qtbase[core] would be enough, but it installs qtbase[brotli,concurrent,core,dbus,default-features,doubleconversion,freetype,gui,harfbuzz,icu,jpeg,network,openssl,pcre2,png,sql,sql-psql,sql-sqlite,testlib,widgets,zstd] and all the needed dependencies.