feat(3p/lisp/closure-html): init at 2017-04-19

This one requires a bit of jumping through hoops. Patching the dtd /
catalog lookup is quite straightforward and similar to cxml, but the
CLOSURE-HTML:*html-dtd* variable gives us a bit of trouble: It is
defined quite late in `html-parser.lisp`, but files that need to be
built first already reference it. SBCL has apparently decided to be
particular about this and emits a `WARNING` (!) condition for this
which is also worthy of `failure-p` of `compile-file` being true,
so that `buildLisp` will abort compilation. We workaround this issue
by injecting an extra source file which `defvar`s the desired symbol.

A similar issue exists with `dump-dtd` which references
`CL-USER:*HTML-DTD*` for some reason. Since this is a helper intended
for development (?) and not exported we just throw it away via a
patch.

Change-Id: Ic0f92815a21f3793925c49a70a72f4a86791efe4
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3263
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>

third_party/lisp/closure-html/no-double-defun.patch

@@ -0,0 +1,78 @@
+diff --git a/src/parse/sgml-dtd.lisp b/src/parse/sgml-dtd.lisp
+index de774c0..dbee852 100644
+--- a/src/parse/sgml-dtd.lisp
++++ b/src/parse/sgml-dtd.lisp
+@@ -624,73 +624,6 @@
+           (return))))
+     classes))
+ 
+-;;;; ----------------------------------------------------------------------------------------------------
+-;;;;  Compiled DTDs
+-;;;;
+-
+-;; Since parsing and 'compiling' DTDs is slow, I'll provide for a way
+-;; to (un)dump compiled DTD to stream.
+-
+-(defun dump-dtd (dtd sink)
+-  (let ((*print-pretty* nil)
+-        (*print-readably* t)
+-        (*print-circle* t))
+-    (princ "#." sink)
+-    (prin1
+-     `(MAKE-DTD :NAME ',(dtd-name dtd)
+-                :ELEMENTS (LET ((R (MAKE-HASH-TABLE :TEST #'EQ)))
+-                               (SETF ,@(let ((q nil))
+-                                         (maphash (lambda (key value)
+-                                                    (push `',value q)
+-                                                    (push `(GETHASH ',key R) q))
+-                                                  (dtd-elements dtd))
+-                                         q))
+-                               R)
+-                :ENTITIES ',(dtd-entities dtd)
+-                :RESOLVE-INFO (LET ((R (MAKE-HASH-TABLE :TEST #'EQUAL))) 
+-                                   (SETF ,@(let ((q nil))
+-                                             (maphash (lambda (key value)
+-                                                        (push `',value q)
+-                                                        (push `(GETHASH ',key R) q))
+-                                                      (dtd-resolve-info dtd))
+-                                             q))
+-                                   R)
+-                ;; XXX surclusion-cache fehlt
+-                )
+-     sink)))
+-
+-;;XXX
+-(defun save-html-dtd ()
+-  (with-open-file (sink "html-dtd.lisp" :direction :output :if-exists :new-version)
+-    (print `(in-package :sgml) sink)
+-    (let ((*package* (find-package :sgml)))
+-      (princ "(SETQ " sink)
+-      (prin1 'cl-user::*html-dtd* sink)
+-      (princ " '" sink)
+-      (dump-dtd cl-user::*html-dtd* sink)
+-      (princ ")" sink))))
+-
+-;;; --------------------------------------------------------------------------------
+-;;;  dumping DTDs
+-
+-
+-(defun dump-dtd (dtd filename)
+-  (let ((*foo* dtd))
+-    (declare (special *foo*))
+-    (with-open-file (sink (merge-pathnames filename "*.lisp")
+-                     :direction :output
+-                     :if-exists :new-version)
+-      (format sink "(in-package :sgml)(locally (declare (special *foo*))(setq *foo* '#.*foo*))"))
+-    (compile-file (merge-pathnames filename "*.lisp"))))
+-
+-(defun undump-dtd (filename)
+-  (let (*foo*)
+-    (declare (special *foo*))
+-    (load (compile-file-pathname (merge-pathnames filename "*.lisp"))
+-          :verbose nil
+-          :print nil)
+-    *foo*))
+-
+ (defmethod make-load-form ((self dtd) &optional env)
+   (declare (ignore env))
+   `(make-dtd :name                  ',(dtd-name self)