Cannot decode wrong mime subject.

["Kirill A. Shutemov" <kirya85@xxxxxxx>]

If letter has subject like '=?koi8-r?Q?=F2=C1=D3=D3=D9=CC=CB=C1 OZ.by 
04.12.2003?=' i. e. wrong encoded(Don't conform to rfc2047 becouse contain 
spaces), Mutt cannot display it correctly. Attached patch allows correctly 
decode wrong MIME subject within spaces and tabs.

--- rfc2047.c.orig      2003-12-07 21:27:59 +0200
+++ rfc2047.c   2003-12-07 22:08:40 +0200
@@ -700,12 +700,12 @@
   while ((p = strstr (q, "=?")))
   {
     for (q = p + 2;
-        0x20 < *q && *q < 0x7f && !strchr ("()<>@,;:\"/[]?.=", *q);
+        *q == 0x09 || (0x20 <= *q && *q < 0x7f && !strchr ("()<>@,;:\"/[]?.=", 
*q));
         q++)
       ;
     if (q[0] != '?' || !strchr ("BbQq", q[1]) || q[2] != '?')
       continue;
-    for (q = q + 3; 0x20 < *q && *q < 0x7f && *q != '?'; q++)
+    for (q = q + 3; *q == 0x09 || (0x20 <= *q && *q < 0x7f && *q != '?'); q++)
       ;
     if (q[0] != '?' || q[1] != '=')
     {

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