Remove the constexpr invalid enums, since they are not accepted by clang-20.

diff --git a/sandbox/win/src/nt_internals.h b/sandbox/win/src/nt_internals.h
index 485215fc82c5..ed63f04a8003 100644
--- a/sandbox/win/src/nt_internals.h
+++ b/sandbox/win/src/nt_internals.h
@@ -37,20 +37,17 @@ typedef NTSTATUS(WINAPI* NtOpenFileFunction)(OUT PHANDLE FileHandle,
                                              OUT PIO_STATUS_BLOCK IoStatusBlock,
                                              IN ULONG ShareAccess,
                                              IN ULONG OpenOptions);
 
 typedef NTSTATUS(WINAPI* NtCloseFunction)(IN HANDLE Handle);
 
 #if !defined(__MINGW32__)
 // Uses undocumented value not in FILE_INFORMATION_CLASS.
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wenum-constexpr-conversion"
-constexpr auto FileRenameInformation = static_cast<FILE_INFORMATION_CLASS>(10);
-#pragma clang diagnostic push
+const auto FileRenameInformation = static_cast<FILE_INFORMATION_CLASS>(10);
 
 typedef struct _FILE_RENAME_INFORMATION {
   BOOLEAN ReplaceIfExists;
   HANDLE RootDirectory;
   ULONG FileNameLength;
   WCHAR FileName[1];
 } FILE_RENAME_INFORMATION, *PFILE_RENAME_INFORMATION;
 #endif
@@ -173,20 +170,17 @@ typedef NTSTATUS(WINAPI* NtOpenSectionFunction)(
 
 typedef NTSTATUS(WINAPI* NtSetInformationThreadFunction)(
     IN HANDLE ThreadHandle,
     IN THREADINFOCLASS ThreadInformationClass,
     IN PVOID ThreadInformation,
     IN ULONG ThreadInformationLength);
 
 // Partial definition only for values not in PROCESS_INFO_CLASS.
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wenum-constexpr-conversion"
-constexpr auto ProcessHandleTable = static_cast<PROCESSINFOCLASS>(58);
-#pragma clang diagnostic pop
+const auto ProcessHandleTable = static_cast<PROCESSINFOCLASS>(58);
 
 // Partial definition only adding fields not in winternl.h, from
 // https://msdn.microsoft.com/en-us/library/windows/desktop/aa813706(v=vs.85).aspx
 typedef struct _NT_PEB {
   BYTE InheritedAddressSpace;
   BYTE ReadImageFileExecOptions;
   BYTE BeingDebugged;
   BYTE SpareBool;