[Ada] Fix warnings in C runtime files on Windows

[Ada] Fix warnings in C runtime files on Windows

gcc/ada/

	* adaint.h (__gnat_expect_portable_execvp): Fix prototype.
	(__gnat_expect_poll): Likewise.
	* expect.c [_WIN32]: Include adaint.h file.
	(__gnat_waitpid): Remove useless variable.
	(__gnat_expect_portable_execvp): Add ATTRIBUTE_UNUSED on parameter.
	* raise-gcc.c [SEH] (__gnat_personality_v0): Add ATTRIBUTE_UNUSED.
	* socket.c [_WIN32] (__gnat_getservbyport): Add ATTRIBUTE_UNUSED on
	a couple of parameters.
	(__gnat_gethostbyname): Likewise.
	(__gnat_gethostbyaddr): Likewise.
	(__gnat_getservbyname): Likewise.
	(__gnat_last_socket_in_set): Use variables local to loops.
	(__gnat_socket_ioctl): Cast 3rd parameter to proper type if _WIN32.
	(__gnat_inet_pton): Cast 2nd parameter to proper type if _WIN32.
	* sysdep.c (__gnat_localtime_tzoff): Remove superfluous test.
	* terminals.c [_WIN32]: Include io.h file.
	(is_gui_app): Remove useless variables and fix unsigned comparison.
	(nt_spawnve): Add ATTRIBUTE_UNUSED on first parameter.  Initialize a
	local variable and remove others that are useless.  Add missing cast
	(__gnat_setup_child_communication): Remove useless variable and call
	Use proper formatting string in call to sprintf.
	(__gnat_setup_parent_communication): Cast to proper type.
	(find_child_console): Fix prototype and remove useless variable.
	(find_process_handle): Likewise.
	(_gnat_interrupt_process): Move to after __gnat_interrupt_pid.
	(__gnat_reset_tty): Add ATTRIBUTE_UNUSED on parameter, remove return
	(__gnat_setup_winsize): Add ATTRIBUTE_UNUSED on all parameters.