flake: use clangStdenv for `overlays.default`

We don't support GCC anymore for building, so the overlay currently
fails to evaluate with

    error: assertion '((stdenv).cc.isClang || lintInsteadOfBuild)' failed

`clangStdenv` seems like a reasonable default now.

Noticed while upgrading Lix for our Hydra fork.

Change-Id: I948a7c03b3e5648fc7c596f96e1b8053a9e7f92f

1 files changed, 1 insertions, 1 deletions

diff --git a/flake.nix b/flake.nix
index 46f9e43e8..f77f848ca 100644
--- a/flake.nix
+++ b/flake.nix
@@ -217,7 +217,7 @@
 
       # A Nixpkgs overlay that overrides the 'nix' and
       # 'nix.perl-bindings' packages.
-      overlays.default = overlayFor (p: p.stdenv);
+      overlays.default = overlayFor (p: p.clangStdenv);
 
       hydraJobs = {
         # Binary package for various platforms.