stdenvAdapters: Remove 6 year old comment

Comment was added in 3c36dcc and hasn't been needed because makeStaticBinaries already adds glibc.static

pkgs/stdenv/adapters.nix

@@ -121,9 +121,6 @@ rec {
     # Apple does not provide a static version of libSystem or crt0.o
     # So we can’t build static binaries without extensive hacks.
     ++ lib.optional (!stdenv.hostPlatform.isDarwin) makeStaticBinaries
-
-    # Glibc doesn’t come with static runtimes by default.
-    # ++ lib.optional (stdenv.hostPlatform.libc == "glibc") ((lib.flip overrideInStdenv) [ self.glibc.static ])
   );