Fix repeated forward reference needed character bug

From:
r762 | ph10 | 2011-11-22 14:36:51 +0100 (Út, 22 lis 2011) | 2 lines

16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
    incorrectly expecting the subject to contain another "a" after the start.

Petr Pisar: Changelog removed.
See <http://lists.pcre.org/lurker/message/20111121.203922.3cfd476e.en.html>.


Index: testdata/testoutput11
===================================================================
--- testdata/testoutput11	(revision 761)
+++ testdata/testoutput11	(revision 762)
@@ -1441,4 +1441,10 @@
     xabcd 
  0: c
 
+/(a)(?2){2}(.)/
+    abcd
+ 0: abcd
+ 1: a
+ 2: d
+
 /-- End of testinput11 --/
Index: testdata/testinput11
===================================================================
--- testdata/testinput11	(revision 761)
+++ testdata/testinput11	(revision 762)
@@ -800,4 +800,7 @@
 /(?<=a(*THEN)b)c/
     xabcd 
 
+/(a)(?2){2}(.)/
+    abcd
+
 /-- End of testinput11 --/
Index: pcre_compile.c
===================================================================
--- pcre_compile.c	(revision 761)
+++ pcre_compile.c	(revision 762)
@@ -4884,7 +4884,8 @@
             *lengthptr += delta;
             }
 
-          /* This is compiling for real */
+          /* This is compiling for real. If there is a set first byte for
+          the group, and we have not yet set a "required byte", set it. */
 
           else
             {
@@ -6015,11 +6016,14 @@
               }
             }
 
-          /* Insert the recursion/subroutine item. */
+          /* Insert the recursion/subroutine item. It does not have a set first
+          byte (relevant if it is repeated, because it will then be wrapped 
+          with ONCE brackets). */
 
           *code = OP_RECURSE;
           PUT(code, 1, (int)(called - cd->start_code));
           code += 1 + LINK_SIZE;
+          groupsetfirstbyte = FALSE; 
           }
 
         /* Can't determine a first byte now */