[lldb][test][Windows] Don't check for pexpect with LLDB_ENFORCE_STRICT_TEST_REQUIREMENTS

See #22648 for why we don't use it on
Windows. Any pexpect tests are skipped there.

Author: DavidSpickett

lldb/test/CMakeLists.txt

@@ -11,10 +11,14 @@ endif()
 
 if(LLDB_ENFORCE_STRICT_TEST_REQUIREMENTS)
   message(STATUS "Enforcing strict test requirements for LLDB")
-  set(useful_python_modules
-    psutil  # Lit uses psutil to do per-test timeouts.
-    pexpect # We no longer vendor pexpect.
-  )
+  # Lit uses psutil to do per-test timeouts.
+  set(useful_python_modules psutil)
+
+  if(NOT WIN32)
+    # We no longer vendor pexpect and it is not used on Windows.
+    list(APPEND pexpect)
+  endif()
+
   foreach(module ${useful_python_modules})
     lldb_find_python_module(${module})
     if (NOT PY_${module}_FOUND)