Description:
------------
iconv_mime_decode doesn't recognize lower-case encoding tokens  ('b' or 'q'). These are acceptible according to the MIME RFC (http://www.ietf.org/rfc/rfc2047.txt).

Here is a fix. Edit file: /ext/iconv/iconv.c

Line: 1398
Change
case 'B':
to
case 'B': case 'b':

Line 1403
Change
case 'Q':
to
case 'Q': case 'q':

Reproduce code:
---------------
$string = '=?UTF-8?b?VGhpcyBpcyBhbiBlbmNvZGVkIHN0cmluZyE=?=';
echo iconv_mime_decode($string,1);

Expected result:
----------------
This is an encoded string!

Actual result:
--------------
Warning: iconv_mime_decode() [function.iconv-mime-decode]: Malformed string