Make wide character support optional

Issue #514. FindCursesw modified to make it simpler. Wide character
can be disable by passing NO_WIDECHAR=ON.

src/chat.c

@@ -182,7 +182,11 @@ static void chat_onKey(ToxWindow *self, Messenger *m, wint_t key)
     getmaxyx(self->window, y2, x2);
 
     /* Add printable chars to buffer and print on input space */
+#if HAVE_WIDECHAR
     if (iswprint(key)) {
+#else
+    if (isprint(key)) {
+#endif
         if (ctx->pos != sizeof(ctx->line) - 1) {
             mvwaddstr(self->window, y, x, wc_to_char(key));
             ctx->line[ctx->pos++] = key;

src/main.c

@@ -6,7 +6,6 @@
 #include "config.h"
 #endif
 
-#define _XOPEN_SOURCE_EXTENDED
 #include <curses.h>
 #include <errno.h>
 #include <stdio.h>

src/toxic_windows.h

@@ -4,7 +4,6 @@
 #ifndef _windows_h
 #define _windows_h
 
-#define _XOPEN_SOURCE_EXTENDED
 #include <curses.h>
 #include <stdint.h>
 #include <stdbool.h>

src/windows.c

@@ -234,7 +234,11 @@ void draw_active_window(Messenger *m)
     a->onDraw(a, m);
 
     /* Handle input */
+#ifdef HAVE_WIDECHAR
     get_wch(&ch);
+#else
+    ch = getch();
+#endif
 
     if (ch == '\t' || ch == KEY_BTAB)
         set_next_window((int) ch);