package to make pkg_add work properly when no +BUILD_INFO file exists.
Modify the return value from read_buildinfo() to return 1 for success
and 0 for failure.
Use symbolic constants, rather than integers.
If we can't read the build information, always tell of this fact.
Bump version to 20040730
Addresses PR 26429; a different version of these mods were verified to
allow a +BUILD_INFO-less binary package to be added by Martin Husemann.