fix "libc}/lib" and similar references

Done mostly without any verification.
I didn't bother with libc}/include, as the path is still correct.

pkgs/development/tools/build-managers/cargo/snapshot.nix

@@ -40,7 +40,7 @@ stdenv.mkDerivation {
        "$out/lib/rustlib/rust-installer-version" \
        "$out/lib/rustlib/uninstall.sh"
   '' + (if stdenv.isLinux then ''
-    patchelf --interpreter "${stdenv.glibc}/lib/${stdenv.cc.dynamicLinker}" \
+    patchelf --interpreter "${stdenv.glibc.out}/lib/${stdenv.cc.dynamicLinker}" \
              --set-rpath "${stdenv.cc.cc}/lib/:${stdenv.cc.cc}/lib64/:${zlib}/lib" \
              "$out/bin/cargo"
   '' else "");