Let's let glibc do the right thing for dense/sparse selection. The _alpha_iobase code has been unused since the switch to libpciaccess. It really should have been killed by fba700f1f6a8976. Signed-off-by: Matt Turner <mattst88@gmail.com> Tested-by: Michael Cree <mcree@orcon.net.nz> Signed-off-by: Keith Packard <keithp@keithp.com>