In preparation for the deprecation of `stdenv.isX`.
These shorthands are not conducive to cross-compilation because they
hide the platforms.
Darwin might get cross-compilation for which the continued usage of `stdenv.isDarwin` will get in the way
One example of why this is bad and especially affects compiler packages
https://www.github.com/NixOS/nixpkgs/pull/343059
There are too many files to go through manually but a treewide should
get users thinking when they see a `hostPlatform.isX` in a place where it
doesn't make sense.
```
fd --type f "\.nix" | xargs sd --fixed-strings "stdenv.is" "stdenv.hostPlatform.is"
fd --type f "\.nix" | xargs sd --fixed-strings "stdenv'.is" "stdenv'.hostPlatform.is"
fd --type f "\.nix" | xargs sd --fixed-strings "clangStdenv.is" "clangStdenv.hostPlatform.is"
fd --type f "\.nix" | xargs sd --fixed-strings "gccStdenv.is" "gccStdenv.hostPlatform.is"
fd --type f "\.nix" | xargs sd --fixed-strings "stdenvNoCC.is" "stdenvNoCC.hostPlatform.is"
fd --type f "\.nix" | xargs sd --fixed-strings "inherit (stdenv) is" "inherit (stdenv.hostPlatform) is"
fd --type f "\.nix" | xargs sd --fixed-strings "buildStdenv.is" "buildStdenv.hostPlatform.is"
fd --type f "\.nix" | xargs sd --fixed-strings "effectiveStdenv.is" "effectiveStdenv.hostPlatform.is"
fd --type f "\.nix" | xargs sd --fixed-strings "originalStdenv.is" "originalStdenv.hostPlatform.is"
```
* mpd-touch-screen-gui: use finalAttrs in mkDerivation; reformat
* musescore: use finalAttrs in mkDerivation
* syncthingtray: use stdenv.mkDerivation with a function; reformat
* ocrfeeder: use finalAttrs in mkDerivation; reformat
* castget: use finalAttrs in mkDerivation
* gnome-network-displays: use finalAttrs in mkDerivation
* mailreaders: use finalAttrs in mkDerivation
* mswatch: use finalAttrs in mkDerivation
* uhd: use finalAttrs in mkDerivation
* maxima: use finalAttrs in mkDerivation
* qalculate-gtk: use finalAttrs in mkDerivation
* qalculate-qt: use finalAttrs in mkDerivation
* wxmaxima: use finalAttrs in mkDerivation
* lammps: use finalAttrs in mkDerivation
* mlterm: use finalAttrs in mkDerivation
* video-trimmer: use finalAttrs in mkDerivation
* nerdfonts: use finalAttrs in mkDerivation
* gnomeExtensions.easyScreenCast: use finalAttrs in mkDerivation
* octave: use finalAttrs in mkDerivation; reformat
* comedilib: use finalAttrs in mkDerivation
* cpp-utilities: use finalAttrs in mkDerivation
* libsForQt5.kpeoplevcard: use finalAttrs in mkDerivation; reformat
* liberio: use finalAttrs in mkDerivation
* libqalculate: use finalAttrs in mkDerivation; reformat
* libwtk-sdl2: use finalAttrs in mkDerivation
* libsForQt5.pulseaudio-qt: use finalAttrs in mkDerivation; reformat
* qrupdate: use finalAttrs in mkDerivation; reformat
* libsForQt5.qtforkawesome: use finalAttrs in mkDerivation; reformat
* libsForQt5.qtutilities: use finalAttrs in mkDerivation; reformat
* sqlitecpp: use finalAttrs in mkDerivation; reformat
* tweeny: use finalAttrs in mkDerivation
* volk: use finalAttrs in mkDerivation
* wiringpi: use finalAttrs in mkDerivation
* snzip: use finalAttrs in mkDerivation; reformat
* bpm-tools: use finalAttrs in mkDerivation; reformat
* sacd: use finalAttrs in mkDerivation
* gtk-gnutella: use finalAttrs in mkDerivation; reformat
* sile: use finalAttrs in mkDerivation
* pplatex: use finalAttrs in mkDerivation; reformat
with structuredAttrs lists will be bash arrays which cannot be exported
which will be a issue with some patches and some wrappers like cc-wrapper
this makes it clearer that NIX_CFLAGS_COMPILE must be a string as lists
in env cause a eval failure
