Removed older linux dependencies, updated cmake version requirement in METIS CMakeLists.txt & removed variables that were not used

examples/ABC_EQF.cpp

@@ -502,7 +502,7 @@ Matrix stateActionDiff(const State& xi) {
  * Uses SelfAdjointSolver, completeOrthoganalDecomposition().pseudoInverse()
  */
 EqF::EqF(const Matrix& Sigma, int n, int m)
-    : __dof(6 + 3 * n), __n_cal(n), __n_sensor(m), __X_hat(G::identity(n)),
+    : __dof(6 + 3 * n), __n_cal(n),  __X_hat(G::identity(n)),
       __Sigma(Sigma), __xi_0(State::identity(n)) {
 
     if (Sigma.rows() != __dof || Sigma.cols() != __dof) {

examples/ABC_EQF.h

@@ -312,7 +312,6 @@ class EqF {
 private:
     int __dof;                 // Degrees of freedom
     int __n_cal;               // Number of calibration states
-    int __n_sensor;            // Number of sensors
     G __X_hat;                 // Filter state
     Matrix __Sigma;            // Error covariance
     State __xi_0;              // Origin state

gtsam/3rdparty/metis/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.5)
+cmake_minimum_required(VERSION 3.5...3.22)
 project(METIS)
 
 # Add flags for currect directory and below