AIX status

[David Edelsohn]

	I am able to compile libsupc++ by working around a
libtool/configure problem that disables shared libraries and refuses to
build static objects.

	I am able to compile libio by working around the _POSIX_SOURCE
definition and defining:

typedef off_t __off_t;
typedef off64_t __off64_t;
typedef ssize_t __ssize_t;

in _G_config.h.  The __mbstate_t definition now is provided by
_G_config.h.

	I normally configure without --maintainer-mode and
@MAINTAINER_MODE_TRUE@ is not being replaced in Makefiles during
configuration.

David