Handle xdll-path property for sun, so that linker can find all

libraries in a chain. E.g. in app -> a.so -> b.so, we need to pass
the path to b.so to the linker so that it can verify that all symbols
asked by 'app' and 'b.so' are present.


[SVN r25003]

tools/build

@@ -1 +1 @@
-Subproject commit a2eb2e08cf114d314915df9916d34a33e4e0c68b
+Subproject commit d0cd12f7c5ef2f2682168bd216b3eb4a0ac90777