[PATCH] Prefix CL symbols in ob-lisp.el

[Owen Radcliffe]

Symbols exported by the common-lisp package should be explicitly prefixed
so that users aren't required to be in a package that uses it.  Currently
this is a problem if I want to use org-babel to evaluate Coalton code, but
I'm sure there are other cases where people want to evaluate code outside
of the common-lisp package.

Here are steps to reproduce the issue I am fixing:

1. Start sly and load Coalton:
  - M-x sly
  - (asdf:load-system :coalton)

2. Enter the :coalton-user package, it does not use :cl
  - (in-package :coalton-user)

3. Evaluate the following org-babel src block:
```
#+begin_src lisp
  (coalton (1+ 1))
#+end_src
```
This signals the error below because it is using coalton:let instead of
cl:let.
```
The operator LET is only valid in a Coalton expression.
```

With the patch attached, things behave properly.

```
#+begin_src lisp
  (coalton (1+ 1))
#+end_src

#+RESULTS:
: 2
```

0001-prefix-cl-symbols-so-that-ob-lisp.el-can-be-used-wit.patch
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