[ASM] Add OFF(x) macro for both GAS and ML

Moved from `subsystems/mvdm/dos/asmxtras.inc`

Author: iLauncherDev

sdk/include/asm/asm.inc

@@ -172,6 +172,9 @@ ENDM
     .skip size, fill
 ENDM
 
+/* OFFset macro */
+#define OFF(x) offset x
+
 #define lXdtPrefix fword ptr
 
 ljmp MACRO segment, offset
@@ -324,6 +327,9 @@ ENDM
 #define REPEAT .rept
 #define ENDR .endr
 
+/* OFFset macro */
+#define OFF(x) x
+
 #define lXdtPrefix
 
 .macro ljmp segment, offset

subsystems/mvdm/dos/asmxtras.inc

@@ -27,13 +27,6 @@
     #define DWORD long
 #endif
 
-/* OFFset macro */
-#ifdef _USE_ML
-    #define OFF(x) offset x
-#else
-    #define OFF(x) x
-#endif
-
 /*
  * Set of macros for defining and using structures:
  * - STRUCT(name, ...) defines a structure of name 'name'.