__test_has_construct. In C++17 some tests started failing after a521532aa16df2c06c91488f2a4e787586f0a611. This fixes those errors by suppressing the deprecation warning when calling `construct` in `__test_has_construct`. This is the same solution as `__has_destroy_test` already uses. Reviewers: ldionne, #libc! Subscribers: dexonsmith, libcxx-commits Tags: #libc Differential Revision: https://reviews.llvm.org/D80481