[tests] lib/libc/gen:assert_test: skip tests when NDEBUG setHEADmain

In the event that NDEBUG is specified in CFLAGS--which is most likely
triggered via `MK_ASSERT_DEBUG` == "no" -- all assert(3) statements are
optimized out by design. This breaks the assert(3) tests as they
specifically rely on assert(3) actually raising a `SIGABRT` instead of
quietly succeeding.

Skip both tests if `NDEBUG` is set. There's no sense running the
`assert(true)` test if the result could instead be a false positive.

MFC after:	2 weeks

0 files changed, 0 insertions, 0 deletions