org.el: Remove fixltx2e LaTeX dependency

* org.el (org-latex-default-packages-alist): Remove fixltx2e.

fixltx2e is obsolete.  See LaTeX News 22 for details:
<http://latex-project.org/ltnews/ltnews22.pdf>

etc/ORG-NEWS

@@ -41,6 +41,8 @@ http://orgmode.org/worg/org-contrib/babel/languages/ob-doc-stan.html
 *** Remove ~org-list-empty-line-terminates-plain-lists~
 Two consecutive blank lines always terminate all levels of current
 plain list.
+*** ~fixltx2e~ is removed from ~org-latex-default-packages-alist~
+fixltx2e is obsolete, see LaTeX News 22.
 * Version 8.3
 
 ** Incompatible changes

lisp/org.el

@@ -4068,7 +4068,6 @@ header, or they will be appended."
 (defcustom org-latex-default-packages-alist
   '(("AUTO" "inputenc"  t)
     ("T1"   "fontenc"   t)
-    (""     "fixltx2e"  nil)
     (""     "graphicx"  t)
     (""     "grffile"   t)
     (""     "longtable" nil)
@@ -4089,7 +4088,6 @@ The packages in this list are needed by one part or another of
 Org mode to function properly:
 
 - inputenc, fontenc:  for basic font and character selection
-- fixltx2e: Important patches of LaTeX itself
 - graphicx: for including images
 - grffile: allow periods and spaces in graphics file names
 - longtable: For multipage tables