Function call difference between cygwin and Windows

[Biswapriyo Nath]

If a function calls both cygwin and Windows functions the binary creates
extra subroutine (in assembly) for cygwin ones. Example:

* Windows function:

   call cs:CreatePipe

* cygwin function:

   call ioctl

   ioctl proc near
   jmp cs:__imp_ioctl
   endp

The binary is statically compiled. Why there are extra subroutines? Is this
"by-design"? Or am I missing something?

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