Remove ign-tools from CMakeLists.txt. Not used

[j-rivero]

🦟 Bug fix

Summary

Code is looking for ign-tools while I can not find any place where it is used.

Checklist

Note to maintainers: Remember to use Squash-Merge

[codecov]

Codecov Report

Merging #56 (d7de400) into ign-plugin1 (ccf671d) will decrease coverage by 4.10%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           ign-plugin1      #56      +/-   ##
===============================================
- Coverage        99.82%   95.71%   -4.11%     
===============================================
  Files               15       15              
  Lines              584      584              
===============================================
- Hits               583      559      -24     
- Misses               1       25      +24     

Impacted Files	Coverage Δ
loader/src/ign.cc	0.00% <0.00%> (-96.00%)	⬇️

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[traversaro]

That line was added in https://github.com/ignitionrobotics/ign-plugin/pull/32/files, and it seems that it was used at least in https://github.com/ignitionrobotics/ign-plugin/blob/ign-plugin1/loader/CMakeLists.txt#L7 to decide if to include src/ign_TEST.cc in the compiled tests.

[scpeters]

That line was added in https://github.com/ignitionrobotics/ign-plugin/pull/32/files, and it seems that it was used at least in https://github.com/ignitionrobotics/ign-plugin/blob/ign-plugin1/loader/CMakeLists.txt#L7 to decide if to include src/ign_TEST.cc in the compiled tests.

see #57