TestHarnessRunner: Use VirtualAlloc for mapping regions.

Needs to be alligned to allocation size. Which is a page on Linux, or
64k on Windows.

In order to map at `0x1'0000` on Wine, we need to use a special case DOS
area allocation path.

Source/Tools/FEXLoader/TestHarnessRunner.cpp

@@ -208,7 +208,7 @@ int main(int argc, char **argv, char **const envp) {
                                                : FEX::HLE::x32::CreateHandler(CTX.get(), SignalDelegation.get(), std::move(Allocator));
 
     // Run through FEX
-    if (!Loader.MapMemory(SyscallHandler.get())) {
+    if (!Loader.MapMemory()) {
       // failed to map
       LogMan::Msg::EFmt("Failed to map %d-bit elf file.", Loader.Is64BitMode() ? 64 : 32);
       return -ENOEXEC;