Added default void RSA pubkey to avoid interactivity in binary-bootstrap.

xbps-src

@@ -245,6 +245,8 @@ install_bbotstrap() {
             _subarch="-${XBPS_TARGET_PKG#*-}"
         fi
     fi
+    mkdir -p $XBPS_MASTERDIR/var/db/xbps/keys
+    cp -f $XBPS_COMMONDIR/repo-keys/*.plist $XBPS_MASTERDIR/var/db/xbps/keys
     ${_bootstrap_arch} xbps-install -S --repository=${XBPS_REPOSITORY} \
         ${XBPS_INSTALL_ARGS} -c ${XBPS_HOSTDIR}/repocache \
         -r $XBPS_MASTERDIR -y base-chroot${_subarch}