Rename LLVM_EXECUTE_ONLY_CODE to RUNTIMES_EXECUTE_ONLY_CODE

Author: Il-Capitano

libunwind/CMakeLists.txt

@@ -330,7 +330,7 @@ if (C_SUPPORTS_COMMENT_LIB_PRAGMA)
   endif()
 endif()
 
-if (LLVM_EXECUTE_ONLY_CODE)
+if (RUNTIMES_EXECUTE_ONLY_CODE)
   add_compile_definitions(_LIBUNWIND_EXECUTE_ONLY_CODE)
 endif()