Tangling does not detect src blocks with capital BEGIN_SRC/END_SRC when case-fold-search nil

[Christopher Genovese <genovese@cmu.edu>]

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When tangling a file whose source code blocks have capitalized BEGIN_SRC and
END_SRC (as produced by <s-TAB for instance),  org-babel-tangle will not
detect the source code blocks when case-fold-search is nil.

The variable org-babel-src-block-regexp has the begin_src and end_src in
lower
case, and neither the code generated by the macro org-babel-map-src-blocks
(in
ob-core.el) nor its caller org-babel-tangle-collect-blocks (in
ob-tangle.el) set
case-fold-search dynamically to make this regex match the capitalized
blocks in
org-babel-map-src-blocks.

I've included a minimal sample file below, but it's pretty simple to
reproduce
with Emacs -q. I also included a simple patch to ob-core.el (in
org-babel-map-src-blocks)
that I tested quickly, in case it helps.

For reference, I'm running org 8.2.10 and GNU Emacs 24.4.1 on Mac OS X
10.7.5.

  -- Chris

### Small example
The source code block is not detected by =org-babel-tangle= when
=case-fold-search= is nil. Then change the begin/end to lower case.

#+BEGIN_SRC R
  matrix(c(1:9), ncol=3)
#+END_SRC

#+RESULTS:
| 1 | 4 | 7 |
| 2 | 5 | 8 |
| 3 | 6 | 9 |

See =org-babel-src-block-regexp=,  =org-babel-map-src-blocks=, and its
caller
=org-babel-tangle-collect-blocks=.

#+PROPERTY: header-args :tangle yes :comments org

# Local Variables:
# org-confirm-babel-evaluate: nil
# End:


### Quick patch (only tested quickly)
*** ~/.emacs.d/elpa/org-20141027/ob-core.el    Sun Nov  2 16:58:38 2014
--- /tmp/ob-core.el    Sat Dec 13 18:42:21 2014
*************** beg-body --------- point at the beginnin
*** 995,1001 ****
  end-body --------- point at the end of the body"
    (declare (indent 1))
    (let ((tempvar (make-symbol "file")))
!     `(let* ((,tempvar ,file)
          (visited-p (or (null ,tempvar)
                 (get-file-buffer (expand-file-name ,tempvar))))
          (point (point)) to-be-removed)
--- 995,1002 ----
  end-body --------- point at the end of the body"
    (declare (indent 1))
    (let ((tempvar (make-symbol "file")))
!     `(let* ((case-fold-search t)
!             (,tempvar ,file)
          (visited-p (or (null ,tempvar)
                 (get-file-buffer (expand-file-name ,tempvar))))
          (point (point)) to-be-removed)

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