Previously, `man xdg-user-dirs-update` contained this:
```
--set NAME PATH
Sets the XDG user dir with the given name.
NAME should be one of the following:
PATH must be an absolute path, e.g. $HOME/Some/Directory.
```
Now, it's correctly rendered:
```
--set NAME PATH
Sets the XDG user dir with the given name.
NAME should be one of the following:
DESKTOP
DOWNLOAD
TEMPLATES
PUBLICSHARE
DOCUMENTS
MUSIC
PICTURES
VIDEOS
PATH must be an absolute path, e.g. $HOME/Some/Directory.
```
Because the Darwin SDK automatically propagates libiconv, it is no
longer linked automatically (because that would link libiconv to
everything whether it wanted it or not).
xdg-user-dirs is failing to link not because it assumes libiconv comes
with libc but because of a bug in its build system. The `configure`
script detects how to link libiconv, but `Makefile.am` does not make use
of that to link libiconv when it is needed.
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"
```
