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"
```
P4V includes a bunch of extra binaries in its bin directory that are
only useful as part of their wrapper scripts. They really belong in a
libexec-style directory, but their wrappers hardcode bin, so we take the
easier approach of wrapping their wrappers.
P4V comes with a compatible set of Qt libraries that just need to be
patchelf'd to be usable, which avoids the need for the crypto hack we
were using. Switch to using autoPatchelfHook for all libraries, and
prefer the distribution's Qt libraries as part of that.
This also fixes a bug in the distributed version of p4d, which prevented
DVCS from working correctly in P4V.
The 2017.3 version of p4v is linked against `libssl.so.1.0.0`. Since
the default openssl in NixOS 2019.09 has been changed to openssl 1.1,
the p4v package must now import the openssl_1_0_2 derivation.
