[rtsan] Fix-forward TEST(TestRtsanInterceptors, PpollDiesWhenRealtime)

Buildbot breakage:
home/b/sanitizer-aarch64-linux/build/llvm-project/compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp:1090:19: error: missing field 'tv_nsec' initializer [-Werror,-Wmissing-field-initializers]
 1090 |   timespec ts = {0};

introduced by https://github.com/llvm/llvm-project/pull/120366/files

Author: thurstond

compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp

@@ -1087,7 +1087,7 @@ TEST(TestRtsanInterceptors, PpollDiesWhenRealtime) {
   fds[0].fd = 0;
   fds[0].events = POLLIN;
 
-  timespec ts = {0};
+  timespec ts = {0, 0};
 
   auto Func = [&fds, &ts]() { ppoll(fds, 1, &ts, nullptr); };