[FREELDR:NTLDR] Enable EMS support on all platforms

Set the `HeadlessLoaderBlock` for all platforms, since headless support
is platform-independent. Addendum to commit ea93b886df.

boot/freeldr/freeldr/ntldr/headless.c

@@ -235,7 +235,7 @@ WinLdrSetupEms(
     PCSTR Option;
 
     /* Start fresh */
-    RtlZeroMemory(&LoaderRedirectionInformation, sizeof(HEADLESS_LOADER_BLOCK));
+    RtlZeroMemory(&LoaderRedirectionInformation, sizeof(LoaderRedirectionInformation));
     LoaderRedirectionInformation.PciDeviceId = PCI_INVALID_VENDORID;
 
     /* Use a direction port if one was given, or use ACPI to detect one instead */

boot/freeldr/freeldr/ntldr/winldr.c

@@ -263,17 +263,16 @@ WinLdrInitializePhase1(PLOADER_PARAMETER_BLOCK LoaderBlock,
         List_PaToVa(&Extension->BootApplicationPersistentData);
     }
 
-#ifdef _M_IX86
-    /* Set headless block pointer */
+    /* Set the headless block pointer */
     if (WinLdrTerminalConnected)
     {
         Extension->HeadlessLoaderBlock = &WinLdrSystemBlock->HeadlessLoaderBlock;
         RtlCopyMemory(Extension->HeadlessLoaderBlock,
                       &LoaderRedirectionInformation,
-                      sizeof(HEADLESS_LOADER_BLOCK));
+                      sizeof(LoaderRedirectionInformation));
         Extension->HeadlessLoaderBlock = PaToVa(Extension->HeadlessLoaderBlock);
     }
-#endif
+
     /* Load drivers database */
     RtlStringCbCopyA(MiscFiles, sizeof(MiscFiles), BootPath);
     RtlStringCbCatA(MiscFiles, sizeof(MiscFiles), "AppPatch\\drvmain.sdb");

boot/freeldr/freeldr/ntldr/winldr.h

@@ -48,9 +48,7 @@ typedef struct _LOADER_SYSTEM_BLOCK
     LOADER_PARAMETER_BLOCK LoaderBlock;
     LOADER_PARAMETER_EXTENSION Extension;
     SETUP_LOADER_BLOCK SetupBlock;
-#ifdef _M_IX86
     HEADLESS_LOADER_BLOCK HeadlessLoaderBlock;
-#endif
     NLS_DATA_BLOCK NlsDataBlock;
     CHAR LoadOptions[MAX_OPTIONS_LENGTH+1];
     CHAR ArcBootDeviceName[MAX_PATH+1];