Fix name clashes with gnulib
- tests/test-plugin.c: Rename setenv and unsetenv to setenv_rpl and unsetenv_rpl respectively.
- unit-tests/test-dl.c: Rename rpl_remove to remove_rpl.
Reported-by: Gisle Vanem
Edited by username-removed-267665
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Reported-by: Gisle Vanem