Fix API break.
* src/posix-fd-t.inc.h (assuan_fd_from_posix_fd): Revert. * src/w32-fd-t.inc.h (assuan_fd_from_posix_fd): Revert. * src/system-w32.c (assuan_fd_from_posix_fd): Revert.
Note that assuan_fd_from_posix_fd is exposed inline function.
- Fixes-commit: 28a40a298661877e1bbeb3eb9ac58a85bdd85b02
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>