patch for consideration

Hello,

The attached file patches the configure script so that the full   
install path is used in libR.dylib when doing a non-Framework build.  
I  have tested it under 10.5 and 10.6 using the FSF version 4.3  
compiler  family. Please feel free to include it in R if you think  
it would be  useful.

What is the point of this exercise? R is relocatable until installed,  
so you cannot embed any paths and configure time and the above patch  
won't work (also try make install rhome=/foo and see it break). To be  
precise R won't even care because DYLD_LIBRARY_PATH overrides the path  
but then the question is why to embed it at all since it is incorrect?

Cheers,
Simon