GumExceptorset_mode

Configures how the exceptor handles exceptions:

• GUM_EXCEPTOR_MODE_FULL: install signal handlers and hook signal()/sigaction() so the target cannot override them (default).
• GUM_EXCEPTOR_MODE_HANDLER_ONLY: install signal handlers but leave signal()/sigaction() alone, so the target is free to replace them.
• GUM_EXCEPTOR_MODE_OFF: don’t install anything.

The signal()/sigaction() distinction is only meaningful on POSIX backends. Must be called before the first gum_exceptor_obtain(), as the backend is created on first obtain.