fixes for gcc 4.0

fixes for gcc 4.0

base/mysql.hh:
    include mysql_version to get rid of that annoying mysql error.
    make sure refcount is set in all constructors
base/pollevent.hh:
dev/ethertap.hh:
dev/pciconfigall.hh:
dev/tsunami_cchip.hh:
dev/tsunami_io.hh:
dev/tsunami_pchip.hh:
sim/param.cc:
    fix for gcc 4

--HG--
extra : convert_revision : be626af2f40ca402818996ef27249ae256c63ef1