[libcxx] Adjust trivial_abi tests for C++03 and C++11 testing

This change replaces std::make_unique with manual construction of
std::unique_ptr to make the tests compatible with C++11
(std::make_unique is a C++14 feature).

libc++ supports std::unique_ptr and std::shared_ptr even in C++03 but
with some limitations: unique_ptr_array.pass.cpp and
shared_ptr_arg.pass.cpp fail to compile in C++03 mode and need to be
disabled.

Differential Revision: https://reviews.llvm.org/D84394