[sql] Rewrite sqlite patching "system".

third_party/sqlite/patches/0013-fts3-backport-Fix-out-of-scope-reference.patch

---- ext/fts3/fts3_write.c.orig  2012-05-08 21:05:03.000000000 +0300
-+++ ext/fts3/fts3_write.c       2012-05-08 21:07:08.000000000 +0300
+From 2049b591163feaa885b482132ea2c769f5ff5a8d Mon Sep 17 00:00:00 2001
+From: Evangelos Foutras <evangelos@foutrelis.com>
+Date: Tue, 12 Jun 2012 18:13:09 +0000
+Subject: [PATCH 13/23] [fts3][backport] Fix out-of-scope reference.
+
+A pointer to a stack variable was being used after the variable's scope had
+ended.
+
+Upstream commit http://www.sqlite.org/src/info/f9c4a7c8f4
+
+BUG=122525
+
+Original review URL: https://chromiumcodereview.appspot.com/10387026
+---
+ third_party/sqlite/src/ext/fts3/fts3_write.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/third_party/sqlite/src/ext/fts3/fts3_write.c b/third_party/sqlite/src/ext/fts3/fts3_write.c
+index 1e71874..3636c7d 100644
+--- a/third_party/sqlite/src/ext/fts3/fts3_write.c
++++ b/third_party/sqlite/src/ext/fts3/fts3_write.c
 @@ -1238,13 +1238,13 @@ int sqlite3Fts3SegReaderPending(
    Fts3SegReader **ppReader        /* OUT: SegReader for pending-terms */
  ){
    Fts3SegReader *pReader = 0;     /* Fts3SegReader object to return */
 +  Fts3HashElem *pE;               /* Iterator variable */
    Fts3HashElem **aElem = 0;       /* Array of term hash entries to scan */
    int nElem = 0;                  /* Size of array at aElem */
    int rc = SQLITE_OK;             /* Return Code */
  
    if( isPrefix ){
      int nAlloc = 0;               /* Size of allocated array at aElem */
 -    Fts3HashElem *pE = 0;         /* Iterator variable */
  
      for(pE=fts3HashFirst(&p->pendingTerms); pE; pE=fts3HashNext(pE)){
        char *zKey = (char *)fts3HashKey(pE);
 @@ -1276,7 +1276,7 @@ int sqlite3Fts3SegReaderPending(
      }
  
    }else{
 -    Fts3HashElem *pE = fts3HashFindElem(&p->pendingTerms, zTerm, nTerm);
 +    pE = fts3HashFindElem(&p->pendingTerms, zTerm, nTerm);
      if( pE ){
        aElem = &pE;
        nElem = 1;
+-- 
+2.2.1
+