[llvm] [gtest] Fix building on OpenBSD/sparc64 (PR #145225)

[Brad Smith via llvm-commits]

https://github.com/brad0 created https://github.com/llvm/llvm-project/pull/145225

Cherry pick a patch from 1.15.0

Add missing include for raise(3)
https://github.com/google/googletest/commit/7f036c5563af7d0329f20e8bb42effb04629f0c0

>From 3deeb10015013b386c8fd17488c78aee71cf883c Mon Sep 17 00:00:00 2001
From: Brad Smith <brad at comstyle.com>
Date: Sun, 22 Jun 2025 05:19:54 -0400
Subject: [PATCH] [gtest] Fix building on OpenBSD/sparc64

Cherry pick a patch from 1.15.0

Add missing include for raise(3)
https://github.com/google/googletest/commit/7f036c5563af7d0329f20e8bb42effb04629f0c0
---
 third-party/unittest/googletest/src/gtest.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/third-party/unittest/googletest/src/gtest.cc b/third-party/unittest/googletest/src/gtest.cc
index 30a5cc3f83a7e..37d380a789831 100644
--- a/third-party/unittest/googletest/src/gtest.cc
+++ b/third-party/unittest/googletest/src/gtest.cc
@@ -43,6 +43,7 @@
 #include <algorithm>
 #include <chrono>  // NOLINT
 #include <cmath>
+#include <csignal>
 #include <cstdint>
 #include <cstdlib>
 #include <cstring>