Several sanitizer tests hang indefinitely on NetBSD:
```
MemorySanitizer-Unit :: ./Msan-x86_64-Test
MemorySanitizer-Unit :: ./Msan-x86_64-with-call-Test
MemorySanitizer-X86_64 :: zero_alloc.cpp
ThreadSanitizer-x86_64 :: signal_cond.cpp
libFuzzer-x86_64-default-NetBSD :: reload.test
```
All of them loop and don't time out, so they need to be terminated
manually for `ninja check-all` to complete. To avoid this, this patch
skips the affected tests or subtests. Unfortunately, the Msan unit tests
still hang on exit in `__cxa_finalize` even if all subtests are skipped
with `llvm-lit -gtest_filter=-*`.
Tested on `x86_64-pc-netbsd11.0`, `x86_64-pc-freebsd15.1`, and
`x86_64-pc-linux-gnu`.
(cherry picked from commit 782f1130177b2c792dc37f0923d21d187a4c150b)
Rainer Orth
fc5861d308