[kaffe] broken url parsing

[Riccardo]

URL parsing in some regression tests is broken if builddir and sourcedir 
are not in the same leaf.

 WARNING: could not properly read security provider files:
          file:///home/multix/kaffe-cvs/sunos-build/test/regression//
export/home0/kaffe_nfs/kaffe_cvs/kaffe/libraries/clib//security/Kaffe.
security
          file:///home/multix/kaffe-cvs/sunos-build/test/regression//
export/home0/kaffe_nfs/kaffe_cvs/kaffe/libraries/clib//security/java.
security
          file:///home/multix/kaffe-cvs/sunos-build/test/regression//
export/home0/kaffe_nfs/kaffe_cvs/kaffe/libraries/clib//security/
classpath.security
          Falling back to standard GNU security provider


-R