Add scouts honor escape hatch for source embedding

tool/scripts/install-emacs.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+# installs emacs version w/ working (replace-buffer-contents)
+# it's sooooo worth it due to clang-format-10 working so well
+set -ex
+sudo apt build-dep emacs
+cd "$HOME"
+export CFLAGS="-O2"
+rm -rf emacs-26.3
+wget http://mirrors.kernel.org/gnu/emacs/emacs-26.3.tar.gz
+tar xf emacs-26.3.tar.gz
+cd emacs-26.3
+./configure
+make -j8
+sudo make install
+rm -f ../emacs-26.3.tar.gz