mkcheck and rpath

[Benjamin Kosnik]

> Why was libtool ditched?

...because cross compilers don't play well with libtool --mode=execute. 
In particular, abstractions for running on a simulator (or multiple 
kinds of simulator) have to exist. 

Since cross compilers were the whole point of dejagnu-ification, it was 
rather significant.

It looks like shared linkage can just be fixed with LD_LIBRARY_PATH, like 
the g++ testsuite. 

-benjamin