fix: guard breakpoint() with x86 check for ARM64 Windows support

The breakpoint() function uses x86-specific intrinsics (__stosb, __movsb)
and x86 debug registers (Dr0, Dr7 from CONTEXT) that don't exist on ARM64
Windows. This causes compilation to fail when targeting aarch64-pc-windows-msvc.

Added the same #if (!x86) return false; #endif guard that msr() already uses.

Author: Dreaming-Codes

src/vmaware.hpp

@@ -11956,6 +11956,9 @@ struct VM {
      * @implements VM::BREAKPOINT
      */
     [[nodiscard]] static bool breakpoint() {
+    #if (!x86)
+        return false;
+    #endif
         const HMODULE ntdll = util::get_ntdll();
         if (!ntdll) return false;