sysdep.c: Include conio.h if __MINGW32__ and !OLD_MINGW.

sysdep.c: Include conio.h if __MINGW32__ and !OLD_MINGW.

	* sysdep.c: Include conio.h if __MINGW32__ and !OLD_MINGW.

	* ctrl_c.c (__gnat_int_handler): Remove declaration.

	* decl.c (creat_concat_name):  Const-ify prefix.

	* adaint.c: Include ctype.h if __MINGW32__.
	(__gnat_readlink): Mark arguments as possibly unused.
	(__gnat_symlink): Likewise.
	(__gnat_is_symbolic_link): Likewise.
	(__gnat_portable_spawn): Likewise.  Cast last arg of spawnvp to match
	declaration
	(__gnat_file_time_name): Don't declare struct stat statbuf when
	not needed.
	(__gnat_is_absolute_path): Add parenthesis around condition of
	'if' statement to avoid warning.
	(__gnat_plist_init): Specify void as parameter.
	(plist_enter): Likewise.
	(plist_leave): Likewise.
	(remove_handle): Make static. Initialize prev.

From-SVN: r72824