add missing inline

Author: davebayer

libcudacxx/include/cuda/__cmath/sincos.h

@@ -65,7 +65,7 @@ struct _CCCL_TYPE_VISIBILITY_DEFAULT sincos_result
 //! @return The \c cuda::sincos_result with the results of sin and cos operations.
 _CCCL_TEMPLATE(class _Tp)
 _CCCL_REQUIRES(::cuda::std::__is_fp_v<_Tp>)
-[[nodiscard]] _CCCL_API sincos_result<_Tp> sincos(_Tp __v) noexcept
+[[nodiscard]] _CCCL_API inline sincos_result<_Tp> sincos(_Tp __v) noexcept
 {
   sincos_result<_Tp> __ret{};
 #if defined(_CCCL_BUILTIN_SINCOSF)
@@ -116,7 +116,7 @@ _CCCL_REQUIRES(::cuda::std::__is_fp_v<_Tp>)
 //! @return The \c cuda::sincos_result with the results of sin and cos operations.
 _CCCL_TEMPLATE(class _Tp)
 _CCCL_REQUIRES(::cuda::std::is_integral_v<_Tp>)
-[[nodiscard]] _CCCL_API sincos_result<double> sincos(_Tp __v) noexcept
+[[nodiscard]] _CCCL_API inline sincos_result<double> sincos(_Tp __v) noexcept
 {
   return ::cuda::sincos(static_cast<double>(__v));
 }