Comment out if-defs that cause build falure.

Suggested-by: Armas Spann <zappel@simple-co.de>

--- a/src/runtime/src/native/external/llvm-libunwind/src/Registers.hpp
+++ b/src/runtime/src/native/external/llvm-libunwind/src/Registers.hpp
@@ -318,11 +318,13 @@
 class _LIBUNWIND_HIDDEN Registers_x86_64;
 extern "C" void __libunwind_Registers_x86_64_jumpto(Registers_x86_64 *);
 
+/* not applicable if libunwind is used
 #if defined(_LIBUNWIND_USE_CET)
 extern "C" void *__libunwind_cet_get_jump_target() {
   return reinterpret_cast<void *>(&__libunwind_Registers_x86_64_jumpto);
 }
 #endif
+*/
 
 class _LIBUNWIND_HIDDEN Registers_x86_64 {
 public:
--- a/src/runtime/src/native/external/llvm-libunwind/src/UnwindCursor.hpp
+++ b/src/runtime/src/native/external/llvm-libunwind/src/UnwindCursor.hpp
@@ -3022,12 +3022,14 @@
 }
 #endif
 
+/* not applicable if libunwind is used
 #if defined(_LIBUNWIND_USE_CET)
 extern "C" void *__libunwind_cet_get_registers(unw_cursor_t *cursor) {
   AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
   return co->get_registers();
 }
 #endif
+*/
 } // namespace libunwind
 
 #endif // __UNWINDCURSOR_HPP__