r26255 is forcing the use of __malloc_hook which is implemented in
opal/mca/memory/linux however that is not compiled in the library
when built on Solaris thus causing a referenced symbol not found
when libmpi tries to load the openib btl.
I am looking how to fix this now but if someone has a good idea how
to detect when __malloc_hook is used (or not) I'd be interested in