Add missing ts.el dependency to buffer.el

Since script.el depends on buffer.el now, buffer.el fails to evaluate because of
a missing dependency on ts.el.

Blindspots like this make me want to eventually support testing individual loads
of each of the libraries in my .emacs.d/wpc directory.

emacs/.emacs.d/wpc/buffer.el

@@ -32,6 +32,7 @@
 (require 'set)
 (require 'cycle)
 (require 'struct)
+(require 'ts)
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; Library