make-bootstrap-tools: fixup after glibc update

There's a generated header that got comment about the source header
from glibc.dev, which added unwanted runtime dependency.  Tested:
nix build -f pkgs/top-level/release.nix stdenvBootstrapTools.{aarch64,i686,x86_64}-linux.test

pkgs/stdenv/linux/make-bootstrap-tools.nix

@@ -175,6 +175,7 @@ in with pkgs; rec {
         nuke-refs $out/lib/*
         nuke-refs $out/libexec/gcc/*/*/*
         nuke-refs $out/lib/gcc/*/*/*
+        nuke-refs $out/lib/gcc/*/*/include-fixed/*/*
 
         mkdir $out/.pack
         mv $out/* $out/.pack