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

third_party/sqlite/src/test/alter2.test

Index: third_party/sqlite/src/test/alter2.test
diff --git a/third_party/sqlite/src/test/alter2.test b/third_party/sqlite/src/test/alter2.test
index 712960c0eaf9e3cffacc97995329fb1bb92e993d..14be637f970ffd3a6a6875420a2196faf3e05a71 100644
--- a/third_party/sqlite/src/test/alter2.test
+++ b/third_party/sqlite/src/test/alter2.test
@@ -137,6 +137,7 @@ do_test alter2-1.8 {
 do_test alter2-1.9 {
   # ALTER TABLE abc ADD COLUMN d;
   alter_table abc {CREATE TABLE abc(a, b, c, d);}
+  if {[permutation] == "prepare"} { db cache flush }
   execsql { SELECT * FROM abc; }
   execsql {
     UPDATE abc SET d = 11 WHERE c IS NULL AND a<4;
@@ -314,8 +315,8 @@ do_test alter2-6.1 {
 } {2}
 ifcapable attach {
   do_test alter2-6.2 {
-    file delete -force test2.db-journal
-    file delete -force test2.db
+    forcedelete test2.db-journal
+    forcedelete test2.db
     execsql {
       ATTACH 'test2.db' AS aux;
       CREATE TABLE aux.t1(a, b);