Enable to select a header file of curses library

[Hamayama]

Hello.

There are three header file name variations of curses library.

• ncurses.h
  ( https://stackoverflow.com/questions/59555474/difference-between-the-headers-ncurses-h-and-curses-h )

• curses.h
  ( ncurses source code )
  ( PDCurses source code )

• pdcurses.h
  ( PDCurses installed by MSYS2/MinGW-w64 package.
  https://github.com/msys2/MINGW-packages/blob/6f2023d39f1e61b2ff176e89500b84077f6aac3b/mingw-w64-pdcurses/PKGBUILD#L78 )

So, I tried to enable to select a header file of curses library by *features*.

Available feature names are as follows.

feature name	header file	remarks
:use-curses-header	curses.h
:use-pdcurses-header	pdcurses.h
(none)	ncurses.h	(default)

An example of .asd file might be as follows.

;; my-app.asd

#+win32
(eval-when (:load-toplevel :compile-toplevel :execute)
  (pushnew :use-pdcurses-header *features*))

(defsystem "my-app"
  :depends-on ("cl-charms")
  :components ((:file "my-app-main")
               (:file "my-app-sub")))