stdenv: Fix overriding + `overrideAttrs`

The old stdenv adapters were subtly wrong in two ways:

 - `overrideAttrs` leaked the original, unoverridden `mkDerivation`.

 - `stdenv.override` would throw away any manually-set `mkDerivation`
   from a stdenv reverting to the original.

Now, `mkDerivation` is controlled (nearly directly) via an argument, and
always correctly closes over the final ("self") stdenv. This means the
adapters can work entirely via `.override` without any manual `stdenv //
...`, and both those issues are fixed.

Note hashes are changed, because stdenvs no previously overridden like
`stdenvNoCC` and `crossLibcStdenv` now are. I had to add some
`dontDisableStatic = true` accordingly. The flip side however is that
since the overrides compose, we no longer need to override anything but
the default `stdenv` from which all the others are created.

1 files changed, 1 insertions, 0 deletions

diff --git a/pkgs/os-specific/linux/musl/default.nix b/pkgs/os-specific/linux/musl/default.nix
index ae175a36324..f19c7ea7a44 100644
--- a/pkgs/os-specific/linux/musl/default.nix
+++ b/pkgs/os-specific/linux/musl/default.nix
@@ -82,6 +82,7 @@ stdenv.mkDerivation rec {
   outputs = [ "out" "dev" ];
 
   dontDisableStatic = true;
+  dontAddStaticConfigureFlags = true;
   separateDebugInfo = true;
 
   NIX_DONT_SET_RPATH = true;