[lldb][test] Disable WriteWithTimeout test on Windows

This is still flaky on our Windows on Arm bot:
******************** TEST 'lldb-unit :: Host/./HostTests.exe/8/10' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\tools\lldb\unittests\Host\.\HostTests.exe-lldb-unit-3616-8-10.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=10 GTEST_SHARD_INDEX=8 C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\tools\lldb\unittests\Host\.\HostTests.exe
--

Script:
--
C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\tools\lldb\unittests\Host\.\HostTests.exe --gtest_filter=PipeTest.WriteWithTimeout
--
C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\unittests\Host\PipeTest.cpp(110): error: Expected: (dur) >= (std::chrono::seconds(2)), actual: 8-byte object <1C-A6 34-77 00-00 00-00> vs 8-byte object <02-00 00-00 00-00 00-00>

C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\unittests\Host\PipeTest.cpp:110
Expected: (dur) >= (std::chrono::seconds(2)), actual: 8-byte object <1C-A6 34-77 00-00 00-00> vs 8-byte object <02-00 00-00 00-00 00-00>

Author: DavidSpickett

lldb/unittests/Host/PipeTest.cpp

@@ -55,6 +55,8 @@ TEST_F(PipeTest, OpenAsReader) {
 }
 #endif
 
+// This test is flaky on Windows on Arm.
+#ifndef _WIN32
 TEST_F(PipeTest, WriteWithTimeout) {
   Pipe pipe;
   ASSERT_THAT_ERROR(pipe.CreateNew(false).ToError(), llvm::Succeeded());
@@ -150,3 +152,4 @@ TEST_F(PipeTest, WriteWithTimeout) {
                         .ToError(),
                     llvm::Succeeded());
 }
+#endif /*ifndef _WIN32*/