Handle read-only emacsql install diretory
Handle read-only emacsql install diretory

Some systems will have set installs to read-only. This means that we
cannot comopile emacsql-sqlite directly in that directory. Luckily, it
is very easy to make emacsql-sqlite compile to an arbitrary directory.
This patch uses ~/.emacs.d/sqlite/emacsql-sqlite as a backup when the
install directory is read only.

emacsmirror/emacsql,skeeto/emacsql,tarsius/emacsql