python-selftest.exp fails with an error when using the
native-gdbserver.exp board.
The bug is that the selftest code doesn't work in this situation. It
never has.
This patch fixes the problem by pushing the needed check into
do_self_tests. This helps prevent the problem in the future.
* lib/selftest-support.exp (do_self_tests): Reject remote or
non-native targets.
* gdb.gdb/complaints.exp: Remove check.
* gdb.gdb/observer.exp: Remove check.
* gdb.gdb/xfullpath.exp: Remove check.
* gdb.gdb/complaints.exp: Remove check.