* update rules_nixpkgs
* Use hermetic nixpkgs cc toolchain
CHANGELOG_BEGIN
CHANGELOG_END
* Work around Bazel's cc toolchain autodetection
* Use --crosstool_top for hermetic cc toolchain
When using --incompatible_enable_cc_toolchain_resolution instead
cc actions still depend on
`external/local_config_cc/builtin_include_directory_paths`
as well as
`external/nixpkgs_cc_toolchain_config/builtin_include_directory_paths`.
* override local_config_cc
* remove unused attribute
* Fix posix toolchain on Windows
* nixpkgs cc toolchain not on Windows
* Fix nixpkgs cc toolchain on MacOS
* nixpkgs cc toolchain uses bin/cc
* Use darwin.binutils on MacOS
* Remove clang(++) and gcc (g++) symlinks
The toolchain only considers `bin/cc` and having the other symlinks
around could lead to confusion
* Use hermetic toolchain in compatibility workspace
* Avoid empty linker flags
Co-authored-by: Andreas Herrmann <andreas.herrmann@tweag.io>
