This patch removes the 'soname' link option for building the host
library for the 'lx_hybrid_ctors' test. Without this option, the
library's absolute path at build time gets hardcoded into the
application, which should be okay for this simple test case.
Fixes#638.
On Ubuntu 11.10 the host library created for the 'lx_hybrid_ctors' test
doesn't get loaded, because the test object in the library is not being
used by the application. This commit fixes the problem by having the
application call a dummy function in the library.
Fixes#120.
