Merge #267349: haskell-modules/generic-builder.nix: int conversion errors

// optionalAttrs (postPhases != [])              { inherit postPhases; }

// optionalAttrs (stdenv.buildPlatform.libc == "glibc"){ LOCALE_ARCHIVE = "${glibcLocales}/lib/locale/locale-archive"; }

# Implicit pointer to integer conversions are errors by default since clang 15.

# Works around https://gitlab.haskell.org/ghc/ghc/-/issues/23456.

// lib.optionalAttrs stdenv.cc.isClang {

  NIX_CFLAGS_COMPILE = "-Wno-error=int-conversion";

}

# Ensure libc++abi is linked even when clang is invoked as just `clang` or `cc`.

# Works around https://github.com/NixOS/nixpkgs/issues/166205.

# This can be dropped once a fix has been committed to cc-wrapper.