Prepare .gitignore file for NDK build

(cherry picked from commit 84807bc95e)
2021-09-07 21:12:49 +08:00 · 2021-09-07 21:12:49 +08:00 · 17206da434
commit 17206da434
--- a/.gitignore
+++ b/.gitignore
@ -60,3 +60,5 @@ tests/rotctld
 src/hamlibdatetime.h
 .gdbinit
 build/
+libs/
+obj/