SWDEV-546137 - Don't rely on __cplusplus under hiprtc environment (#806)

[ROCm/clr commit: 111f12cbed]

projects/clr/hipamd/include/hip/amd_detail/amd_hip_vector_types.h

@@ -659,7 +659,7 @@ get_native_pointer(const HIP_vector_base<T, n>& base_vec) {
     template<typename T, unsigned int n>
     __HOST_DEVICE__
     inline
-    #if __cplusplus >= 201402L
+    #if __cplusplus >= 201402L && !defined(__HIPCC_RTC__)
     constexpr
     #endif
     bool operator==(