Set BOOST_ROOT to BOOST_ROOT_1_69_0 in Azure Windows job

[taketwo]

One of the recent updates to the agent images used on Azure removed BOOST_ROOT variable: actions/runner-images@e91f213

[kunaltyagi]

Same error (Boost not found)

[SergioRAgostinho]

Our CMake file might be relying on the env BOOST_ROOT actually being set. Setting it to %BOOST_ROOT_1_69_0% might provide the fix

[kunaltyagi]

Seems like the FindBoost in CMake relies on BOOST_ROOT

[taketwo]

Thanks for suggestions.

[kunaltyagi]

LGTM, pending CI (which appears to be going the green way)

[SergioRAgostinho]

The CI gods are against us.

  The following tests FAILED:
  	  1 - test_2d (Exit code 0xc0000135
  )
  	 24 - common_centroid (Exit code 0xc0000135
  )
  	 28 - feature_base (Exit code 0xc0000135
  )
  	 29 - feature_cppf_estimation (Exit code 0xc0000135
  )
  	 30 - feature_normal_estimation (Exit code 0xc0000135
  )
  	 31 - feature_pfh_estimation (Exit code 0xc0000135
  )
  	 32 - feature_cvfh_estimation (Exit code 0xc0000135
  )
  	 33 - feature_ppf_estimation (Exit code 0xc0000135
  )
  	 34 - feature_shot_estimation (Exit code 0xc0000135
  )
  	 35 - feature_boundary_estimation (Exit code 0xc0000135
  )
  	 36 - feature_curvatures_estimation (Exit code 0xc0000135
  )
  	 37 - feature_spin_estimation (Exit code 0xc0000135
  )
  	 38 - feature_rsd_estimation (Exit code 0xc0000135
  )
  	 39 - feature_grsd_estimation (Exit code 0xc0000135
  )
  	 40 - feature_invariants_estimation (Exit code 0xc0000135
  )
  	 41 - feature_board_estimation (Exit code 0xc0000135
  )
  	 42 - feature_flare_estimation (Exit code 0xc0000135
  )
  )
  	110 - sample_consensus_plane_models (Exit code 0xc0000135
  )
  Errors while running CTest

I vote for merge regardless.

[taketwo]

We had this issue already (#2632, #2935) and according to #2935 (comment), the problem lies in Boost directories not set in the system PATH variable.

[kunaltyagi]

We leave the env variable printing for debugging purposes on the CI?

[taketwo]

Yes! It's handy to have them printed always.