Revert "ncurses: Remove obsolete compile fixes"

This reverts commit 4fb684a755.

The compile fixes are still required for host systems using GCC 5.x,
such as Ubuntu 16.04 LTS.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

package/libs/ncurses/patches/200-fix_missing_include.patch

@@ -0,0 +1,14 @@
+--- a/ncurses/curses.priv.h
++++ b/ncurses/curses.priv.h
+@@ -55,6 +55,11 @@ extern "C" {
+ 
+ #include <ncurses_cfg.h>
+ 
++#if NEED_WCHAR_H
++#include <stdarg.h>
++#include <wchar.h>
++#endif
++
+ #if USE_RCS_IDS
+ #define MODULE_ID(id) static const char Ident[] = id;
+ #else