some functions are not inline

[klosworks]

Some functions are not inline. This will cause multiple definition errors in projects that include your lib.
Examples:

  std::string get_last_error()
  FILE *file_from_handle(HANDLE h, const char *mode)
void configure_pipe(HANDLE* read_handle, HANDLE* write_handle, HANDLE* child_handle)

There is already an issue #34, but it is about a specific function and you have a more general problem.

[deanmsands3]

Submitted Pull Request #59 .