[kaffe] pure java vs. native implementations

[Timothy Stack]

hi,

So, on the discussion of replacing native library implementations with 
pure java versions from classpath, I don't see why they both can't be 
included.  With a bit of configure magic everything should work fine...  
For example:

  if libgmp is available && !force_pure_java:
    use native impl
  else
    use pure java impl

Handling this at runtime would be nicer, but this should do for the 
majority of people I would think.

thanks,

tim