[sql] Rewrite sqlite patching "system".

third_party/sqlite/misc.patch

-Index: src/expr.c
-===================================================================
---- src/expr.c  2009-09-08 12:16:11.000000000 -0700
-+++ src/expr.c  2009-09-23 16:58:47.000000000 -0700
-@@ -804,7 +804,9 @@
-       }else{
-         int nSize = exprStructSize(p);
-         memcpy(zAlloc, p, nSize);
--        memset(&zAlloc[nSize], 0, EXPR_FULLSIZE-nSize);
-+        if( EXPR_FULLSIZE>nSize ){
-+          memset(&zAlloc[nSize], 0, EXPR_FULLSIZE-nSize);
-+        }
-       }
- 
-       /* Set the EP_Reduced, EP_TokenOnly, and EP_Static flags appropriately. */
-Index: src/func.c
-===================================================================
---- src/func.c  2009-09-04 13:37:42.000000000 -0700
-+++ src/func.c  2009-09-14 18:18:18.000000000 -0700
-@@ -1020,7 +1020,7 @@
-       }
-     }
-     if( zCharSet ){
--      sqlite3_free(azChar);
-+      sqlite3_free((void*)azChar);
-     }
-   }
-   sqlite3_result_text(context, (char*)zIn, nIn, SQLITE_TRANSIENT);