Silence byte-compiler

These both show up when compiling files separately (e.g., 'make
single').

ob-core already assumes ob-tangle is loaded based on declared
functions, presumably because ob.el is given responsibility for
collectively loading these pieces.  org.el loads org-attach within the
body of a function before calling org-attach-dir.

lisp/ob-core.el

@@ -38,6 +38,7 @@
 (defvar org-link-file-path-type)
 (defvar org-src-lang-modes)
 (defvar org-src-preserve-indentation)
+(defvar org-babel-tangle-uncomment-comments)
 
 (declare-function org-at-item-p "org-list" ())
 (declare-function org-at-table-p "org" (&optional table-type))

lisp/org.el

@@ -122,6 +122,8 @@ Stars are put in group 1 and the trimmed body in group 2.")
 (declare-function org-archive-subtree-default "org-archive" ())
 (declare-function org-archive-to-archive-sibling "org-archive" ())
 (declare-function org-attach "org-attach" ())
+(declare-function org-attach-dir "org-attach"
+		  (&optional create-if-not-exists-p no-fs-check))
 (declare-function org-babel-do-in-edit-buffer "ob-core" (&rest body) t)
 (declare-function org-babel-tangle-file "ob-tangle" (file &optional target-file lang))
 (declare-function org-beamer-mode "ox-beamer" (&optional prefix) t)