fix sqlite porting bug

tests/sqlite/benchmark.c

@@ -81,7 +81,7 @@ int main(){
   RUN("BEGIN;");
 
   // 25000 INSERTs in a transaction
-  for (i = 0; i < 5; i++) {
+  for (i = 0; i < 78; i++) {
     RUN("INSERT INTO t1 VALUES(1,12345,'one 1 one 1 one 1');");
     RUN("INSERT INTO t1 VALUES(2,23422,'two two two two');");
     RUN("INSERT INTO t1 VALUES(3,31233,'three three 33333333333 three');");

tests/sqlite/sqlite3.c

@@ -52942,7 +52942,12 @@ static void dropCell(MemPage *pPage, int idx, int sz, int *pRC){
   endPtr = &data[pPage->cellOffset + 2*pPage->nCell - 2];
   assert( (SQLITE_PTR_TO_INT(ptr)&1)==0 );  /* ptr is always 2-byte aligned */
   while( ptr<endPtr ){
+#ifdef EMSCRIPTEN
+    ptr[0] = ptr[2];
+    ptr[1] = ptr[3];
+#else
     *(u16*)ptr = *(u16*)&ptr[2];
+#endif
     ptr += 2;
   }
   pPage->nCell--;