tests: test_ust_constructor: Use a C-compiled shared object

Similar to the previous change, this change splits the c-style
constructors for the shared object into a separate object which can be
compiled with gcc instead of g++.

This makes it possible to test the constructors are traced even if
LTTng-UST uses the LTTNG_UST_ALLOCATE_COMPOUND_LITERAL_ON_HEAP build
configuration.

Change-Id: Icd96cb30cedc1615951a6fec3c72731776f95d81
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>