kern: add all kthread members

libraries/libvapours/include/vapours/svc/svc_common.hpp

@@ -28,6 +28,8 @@ namespace ams::svc {
     #error "Unknown target for svc::Handle"
 #endif
 
+    static constexpr size_t MaxWaitSynchronizationHandleCount = 0x40;
+
     enum class PseudoHandle : Handle {
         CurrentThread  = 0xFFFF8000,
         CurrentProcess = 0xFFFF8001,