gitignore: ignore new generated test files

It seems that it was forgotten to add these filse to the .gitignore when
the new tests were added.

Sponsored by:	The FreeBSD Foundation

.gitignore

@@ -91,15 +91,19 @@ scripts/sbin/pkg2ng
 !/tests/frontend/*.in
 !/tests/frontend/*.binin
 !/tests/frontend/*.so.*
+/tests/frontend/libfoo.so.1
+/tests/frontend/libtest2fbsd.so.1
+/tests/frontend/libtestfbsd.so.1
 /tests/frontend/test_environment.sh
 /tests/lua
 /tests/metalog
 /tests/merge
 /tests/packing
 /tests/pkg_add_dir_to_del
+/tests/pkg_elf
 /tests/pkg_printf
 /tests/pkg_validation
 /tests/plist
 /tests/ssh
 /tests/utils
-
+/tests/vec