libmagic configury foobar

[Tom Tromey]

>>>>> "Andrew" == Andrew Haley <aph@redhat.com> writes:

Andrew> We were checking for magic.h but not for the linkability of libmagic.
Andrew> This is wrong: we might well have libmagic headers but not have
Andrew> libmagic.so for every arch.

We may want something similar in Classpath.  This CNI code is just a
straightforward translation of the JNI code there.

Tom