Import SQLite 3.7.6.3.

third_party/sqlite/src/src/mem3.c

Index: third_party/sqlite/src/src/mem3.c
diff --git a/third_party/sqlite/src/src/mem3.c b/third_party/sqlite/src/src/mem3.c
index 09a84b673193c08e3bec21a9603a5e4576304201..e2d66815b33431799e82b96b23b0e2a3fb1285fb 100644
--- a/third_party/sqlite/src/src/mem3.c
+++ b/third_party/sqlite/src/src/mem3.c
@@ -22,8 +22,6 @@
 **
 ** This version of the memory allocation subsystem is included
 ** in the build only if SQLITE_ENABLE_MEMSYS3 is defined.
-**
-** $Id: mem3.c,v 1.25 2008/11/19 16:52:44 danielk1977 Exp $
 */
 #include "sqliteInt.h"
 
@@ -578,6 +576,7 @@ static int memsys3Init(void *NotUsed){
 */
 static void memsys3Shutdown(void *NotUsed){
   UNUSED_PARAMETER(NotUsed);
+  mem3.mutex = 0;
   return;
 }