.gitignore: Ignore unit test artifacts

Running "make check" creates all these artifacts that we want git to
ignore.

Closes: #1191
Approved by: alexlarsson

.gitignore

@@ -71,6 +71,24 @@ Flatpak-1.0.*
 /test-doc-portal
 /test-doc-portal.log
 /test-doc-portal.trs
+/test-libglnx-errors
+/test-libglnx-errors.log
+/test-libglnx-errors.trs
+/test-libglnx-fdio
+/test-libglnx-fdio.log
+/test-libglnx-fdio.trs
+/test-libglnx-macros
+/test-libglnx-macros.log
+/test-libglnx-macros.trs
+/test-libglnx-shutil
+/test-libglnx-shutil.log
+/test-libglnx-shutil.trs
+/test-libglnx-xattrs
+/test-libglnx-xattrs.log
+/test-libglnx-xattrs.trs
+/testlibrary
+/testlibrary.log
+/testlibrary.trs
 /testdb.log
 /testdb.trs
 /tests/test-keyring/.gpg-v21-migrated