Fix build for latest OOBase

Signed-off-by: Rick Taylor <rick@tropicalstormsoftware.com>
Use AC_PATH_PROG, it's easier

Signed-off-by: Rick Taylor <rick@tropicalstormsoftware.com>
Stop using Omega/base_types.h and properly autoconf for the missing bits.

Signed-off-by: Rick Taylor <rick@tropicalstormsoftware.com>