[test.cpp] Add missing include (make_xsafe)

12 jobs for 14-automatic-array-casting-in-c-does-not-work in 61 minutes and 47 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
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conda-linux
build_linux_27

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passed #11809
conda-linux
build_linux_34

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conda-linux
build_linux_35

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conda-macosx
build_macosx_27

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build_macosx_34

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conda-macosx
build_macosx_35

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  Test
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conda-linux
test_linux_27

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92.0%
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conda-linux
test_linux_34

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conda-linux
test_linux_35

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conda-macosx
test_macosx_27

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92.0%
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conda-macosx
test_macosx_34

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92.0%
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conda-macosx
test_macosx_35

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92.0%