Delete unused gazebo.hh.in

[scpeters]

🦟 Bug fix

Remove unused header file template

Summary

This was noticed in #1477 (comment), but it's not used (and wouldn't work anyway), so we can delete it.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
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[methylDragon]

The ignition/gazebo/gazebo.hh.in was renamed to gz/sim/sim.hh.in in #1477

I suppose I should create a gazebo.hh.in in gz/sim/ though since CMake is currently using the gazebo project name which is causing gazebo.hh to be generated.

[chapulina]

Ah nice catch, thanks @scpeters . Yeah I was wondering about how could that syntax work.

[codecov]

Codecov Report

Merging #1490 (a8d9ca2) into ign-gazebo3 (738579d) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           ign-gazebo3    #1490   +/-   ##
============================================
  Coverage        34.67%   34.67%           
============================================
  Files               31       31           
  Lines             1993     1993           
============================================
  Hits               691      691           
  Misses            1302     1302           

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