DiskCache: use memory-mapped IO for reads when possible

On Wine, use a unixlib call to get a quality mapping that can track a growing
file.

Source/Windows/ARM64EC/Module.cpp

@@ -11,6 +11,7 @@ $end_info$
 #include <FEXCore/Core/SignalDelegator.h>
 #include <FEXCore/Core/Context.h>
 #include <FEXCore/Core/CoreState.h>
+#include <FEXCore/Core/DiskCacheFileMapper.h>
 #include <FEXCore/Debug/InternalThreadState.h>
 #include <FEXCore/HLE/SyscallHandler.h>
 #include <FEXCore/Config/Config.h>
@@ -606,6 +607,9 @@ NTSTATUS ProcessInit() {
 
   FEX::Windows::Allocator::SetupHooks(NtDll);
   FEX::Windows::UnixLib::Init(NtDll);
+  if (FEX::Windows::UnixLib::Available()) {
+    FEXCore::DiskCache::SetFileMapper(FEX::Windows::UnixLib::MapFile);
+  }
 
   {
     auto HostFeatures = FEX::Windows::CPUFeatures::FetchHostFeatures(IsWine, FEXCore::HostFeatures::HostTypeEnum::Arm64ec);