Prevent duplicate includes

[jwillemsen]

* ridlbe/c++11/writers/servantheader.rb:

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.30%. Comparing base (d32998b) to head (b7580d5).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #438   +/-   ##
=======================================
  Coverage   58.30%   58.30%           
=======================================
  Files         605      605           
  Lines       38514    38514           
  Branches     4193     4193           
=======================================
  Hits        22454    22454           
  Misses      12902    12902           
  Partials     3158     3158           

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