elf: Run constructors on cyclic recursive dlopen (bug 31986)

elf: Run constructors on cyclic recursive dlopen (bug 31986)

This is conceptually similar to the reported bug, but does not
depend on auditing.  The fix is simple: just complete execution
of the constructors.  This exposed the fact that the link map
for statically linked executables does not have l_init_called
set, even though constructors have run.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>