Fix harmless compiler warnings.

FossilOrigin-Name: b3b7b42d9a4a0e7e2be8b2933328a7bec2f49a81

src/insert.c

@@ -786,7 +786,6 @@ void sqlite3Insert(
   /* If this is not a view, open the table and and all indices */
   if( !isView ){
     int nIdx;
-    Index *pIdx;
     nIdx = sqlite3OpenTableAndIndices(pParse, pTab, OP_OpenWrite, 0, -1, 0,
                                       &iDataCur, &iIdxCur);
     aRegIdx = sqlite3DbMallocRawNN(db, sizeof(int)*(nIdx+1));

src/shell.c

@@ -2583,6 +2583,8 @@ static FILE *output_file_open(const char *zFile){
   return f;
 }
 
+#if !defined(SQLITE_OMIT_BUILTIN_TEST)
+#if !defined(SQLITE_OMIT_TRACE) && !defined(SQLITE_OMIT_FLOATING_POINT)
 /*
 ** A routine for handling output from sqlite3_trace().
 */
@@ -2603,6 +2605,8 @@ static int sql_trace_callback(
   }
   return 0;
 }
+#endif
+#endif
 
 /*
 ** A no-op routine that runs with the ".breakpoint" doc-command.  This is