Explicitly hide some BAlert functions that ought to have been
deleted. This prevents binding generators from thinking that these
functions are available, causing undefined symbol errors during
link time.
Change-Id: I56f53808851b82a10f31015d2351d4e2c29b6f33
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6718
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>
