Fix MSVC warning C4018 for sqlite.

third_party/sqlite/patches/0006-Virtual-table-supporting-recovery-of-corrupted-datab.patch

 From 13a64d3c7fb541be8cb753c575837c1b84f5d9fd Mon Sep 17 00:00:00 2001
 From: Scott Hess <shess@chromium.org>
 Date: Sat, 20 Jul 2013 11:42:21 -0700
 Subject: [PATCH 06/16] Virtual table supporting recovery of corrupted
  databases.
 
 "recover" implements a virtual table which uses the SQLite pager layer
 to read table pages and pull out the data which is structurally sound
 (at least at the storage layer).
 
@@ skipping 1873 matching lines @@
 +static int recoverColumn(sqlite3_vtab_cursor *cur, sqlite3_context *ctx, int i){
 +  RecoverCursor *pCursor = (RecoverCursor*)cur;
 +  Recover *pRecover = (Recover*)pCursor->base.pVtab;
 +  u64 iColType;             /* Storage type of column i. */
 +  unsigned char *pColData;  /* Column i's data. */
 +  int shouldFree;           /* Non-zero if pColData should be freed. */
 +  int rc;
 +
 +  FNENTRY();
 +
-+  if( i>=pRecover->nCols ){
++  if( (unsigned)i>=pRecover->nCols ){
 +    return SQLITE_ERROR;
 +  }
 +
 +  /* ROWID alias. */
 +  if( (pRecover->pTypes[i]&MASK_ROWID) ){
 +    sqlite3_result_int64(ctx, leafCursorCellRowid(pCursor->pLeafCursor));
 +    return SQLITE_OK;
 +  }
 +
 +  pColData = NULL;
@@ skipping 286 matching lines @@
 + * recoverCreate().
 + */
 +/* TODO(shess): Explore cases where it would make sense to set *pzErr. */
 +static int recoverInit(
 +  sqlite3 *db,                        /* Database connection */
 +  void *pAux,                         /* unused */
 +  int argc, const char *const*argv,   /* Parameters to CREATE TABLE statement */
 +  sqlite3_vtab **ppVtab,              /* OUT: New virtual table */
 +  char **pzErr                        /* OUT: Error message, if any */
 +){
-+  const unsigned kTypeCol = 4;  /* First argument with column type info. */
-+  Recover *pRecover;            /* Virtual table structure being created. */
-+  char *zDot;                   /* Any dot found in "db.table" backing. */
-+  u32 iRootPage;                /* Root page of backing table. */
-+  char *zCreateSql;             /* Schema of created virtual table. */
++  const int kTypeCol = 4;  /* First argument with column type info. */
++  Recover *pRecover;       /* Virtual table structure being created. */
++  char *zDot;              /* Any dot found in "db.table" backing. */
++  u32 iRootPage;           /* Root page of backing table. */
++  char *zCreateSql;        /* Schema of created virtual table. */
 +  int rc;
 +
 +  /* Require to be in the temp database. */
 +  if( ascii_strcasecmp(argv[1], "temp")!=0 ){
 +    *pzErr = sqlite3_mprintf("recover table must be in temp database");
 +    return SQLITE_MISUSE;
 +  }
 +
 +  /* Need the backing table and at least one column. */
 +  if( argc<=kTypeCol ){
@@ skipping 1382 matching lines @@
     notify.c
  
 +   recover.c
 +
     fts3.c
     fts3_aux.c
     fts3_expr.c
 -- 
 2.2.1