Put "btoa" back into the built directories, since the underlying code is now available in nss/lib.
Put "btoa" back into the built directories, since the underlying code
is now available in nss/lib.

thespooler/nss,thespooler/nss,thespooler/nss,thespooler/nss,thespooler/nss,thespooler/nss,thespooler/nss