COMP: Use C++ headers over C header
COMP: Use C++ headers over C header

Some headers from C library were deprecated in C++ and are no longer
welcome in C++ codebases. Some have no effect in C++. For more details
refer to the C++ 14 Standard [depr.c.headers] section.

This patch replaces C standard library headers with their C++
alternatives and removes redundant ones.

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