Ignore generated lkl-src and web-assets.c

Change-Id: Ie3173518807546dbd6d5f9c14dafaea8d87cf670

Author: RinHizakura

.gitignore

@@ -21,3 +21,5 @@ tests/stress/long-running
 tests/stress/rapid-fork
 tests/stress/signal-race
 !tests/stress/*.c
+build/lkl-src
+src/web-assets.c