'bits/stdc++.h' file not found

On MacOS/clang, I am unable to build the current corsika master:

[ 82%] Building CXX object tests/framework/CMakeFiles/testFramework.dir/testCOMBoost.cpp.o
In file included from /Users/jean/Desktop/corsika/corsika/tests/media/testRefractiveIndex.cpp:19:
/Users/jean/Desktop/corsika/corsika/corsika/media/ExponentialRefractiveIndex.hpp:11:10: fatal error:
      'bits/stdc++.h' file not found
#include <bits/stdc++.h>
         ^~~~~~~~~~~~~~~
1 error generated.

I believe this has been introduced with commit e6ad6c0f.

Looking at the first results from google regarding this error message, it looks like we should just avoid including this header (since it seems to be generally very error-prone)

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