[emacs] add borg-nix-shell and use it to build notmuch's build deps

[~bandali/configs] / lib / borg-nix-shell

diff --git a/lib/borg-nix-shell b/lib/borg-nix-shell
new file mode 160000 (submodule)
index 0000000..84dac9e
--- /dev/null
+++ b/lib/borg-nix-shell
@@ -0,0 +1 @@
+Subproject commit 84dac9e821ea445a6b4542d021d3094b0c1e55d3