Remove unused variables in mapillary/opensfm/opensfm/src/geometry/pose.h

Summary:
LLVM-15 has a warning `-Wunused-but-set-variable` which we treat as an error because it's so often diagnostic of a code issue. Unused variables can compromise readability or, worse, performance.

This diff either (a) removes an unused variable and, possibly, it's associated code, or (b) qualifies the variable with `[[maybe_unused]]`, mostly in cases where the variable _is_ used, but, eg, in an `assert` statement that isn't present in production code.

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Reviewed By: palmje

Differential Revision: D53779585

fbshipit-source-id: d651d6b4cf4dbc777f924f936e9325005c80d2ba

opensfm/src/geometry/pose.h

@@ -17,7 +17,6 @@ class Pose {
   virtual ~Pose() = default;
 
   Pose(const Vec3d& R, const Vec3d& t = Vec3d::Zero()) {
-    Mat4d T_cw = Mat4d::Identity();
     SetFromWorldToCamera(R, t);
   }
   Pose(const Mat3d& R, const Vec3d& t = Vec3d::Zero()) {