[foreign] RFR: add test for C stdlib

[Maurizio Cimadamore]

Hi,
this patch adds a slightly more comprehensive test for C's stdlib 
featuring a wider array of libraries than those tested in the past. The 
test is meant to stress almost all of the binder features, struct 
integration, callbacks, symbolic layout resolution, variadic calls, etc.

I deleted the TypedSortTest which is now subsumed by this one.

Webrev:

http://cr.openjdk.java.net/~mcimadamore/panama/stdlib_test/


Cheers
Maurizio