The `platform` field is pointless nesting: it's just stuff that happens
to be defined together, and that should be an implementation detail.
This instead makes `linux-kernel` and `gcc` top level fields in platform
configs. They join `rustc` there [all are optional], which was put there
and not in `platform` in anticipation of a change like this.
`linux-kernel.arch` in particular also becomes `linuxArch`, to match the
other `*Arch`es.
The next step after is this to combine the *specific* machines from
`lib.systems.platforms` with `lib.systems.examples`, keeping just the
"multiplatform" ones for defaulting.
continuation of #109595
pkgconfig was aliased in 2018, however, it remained in
all-packages.nix due to its wide usage. This cleans
up the remaining references to pkgs.pkgsconfig and
moves the entry to aliases.nix.
python3Packages.pkgconfig remained unchanged because
it's the canonical name of the upstream package
on pypi.
* pgadmin: use https homepage
* msn-pecan: move homepage to github
google code is now unavailable
* pidgin-latex: use https for homepage
* pidgin-opensteamworks: use github for homepage
google code is unavailable
* putty: use https for homepage
* ponylang: use https for homepage
* picolisp: use https for homepage
* phonon: use https for homepage
* pugixml: use https for homepage
* pioneer: use https for homepage
* packer: use https for homepage
* pokerth: usee https for homepage
* procps-ng: use https for homepage
* pycaml: use https for homepage
* proot: move homepage to .github.io
* pius: use https for homepage
* pdfread: use https for homepage
* postgresql: use https for homepage
* ponysay: move homepage to new site
* prometheus: use https for homepage
* powerdns: use https for homepage
* pm-utils: use https for homepage
* patchelf: move homepage to https
* tesseract: move homepage to github
* quodlibet: move homepage from google code
* jbrout: move homepage from google code
* eiskaltdcpp: move homepage to github
* nodejs: use https to homepage
* nix: use https for homepage
* pdf2djvu: move homepage from google code
* game-music-emu: move homepage from google code
* vacuum: move homepae from google code
* refactor and clean up the derivation composition
* add slim variation: the slim variations configure node without npm.
Building node with npm introduces a python runtime depndency through
gyp - slim variation makes sense for building small nodejs production
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