add [[maybe_unused]] to EstimateCamPosePNP() (#1721)

Fixes #1716

Author: Liam-Stow

photon-targeting/src/main/native/include/photon/estimation/VisionEstimation.h

@@ -48,7 +48,7 @@ namespace VisionEstimation {
 
 #include <iostream>
 
-static std::optional<PnpResult> EstimateCamPosePNP(
+[[maybe_unused]] static std::optional<PnpResult> EstimateCamPosePNP(
     const Eigen::Matrix<double, 3, 3>& cameraMatrix,
     const Eigen::Matrix<double, 8, 1>& distCoeffs,
     const std::vector<PhotonTrackedTarget>& visTags,