Add //third_party/sqlite to dirs_to_snapshot, remove net_sql.patch

third_party/sqlite/src/test/whereA.test

Index: third_party/sqlite/src/test/whereA.test
diff --git a/third_party/sqlite/src/test/whereA.test b/third_party/sqlite/src/test/whereA.test
index 5d0aca591ca2790ced5ec27d801d4224df27026a..78826b111c84151e9b4062529b4db1ade1e2cc81 100644
--- a/third_party/sqlite/src/test/whereA.test
+++ b/third_party/sqlite/src/test/whereA.test
@@ -68,6 +68,12 @@ do_test whereA-1.7 {
     SELECT * FROM t1;
   }
 } {3 4.53 {} 2 hello world 1 2 3}
+do_execsql_test whereA-1.8 {
+  SELECT * FROM t1 WHERE b=2 AND a IS NULL;
+} {}
+do_execsql_test whereA-1.9 {
+  SELECT * FROM t1 WHERE b=2 AND a IS NOT NULL;
+} {1 2 3}
 
 do_test whereA-2.1 {
   db eval {