Fix incompatible pointers, GTK style
Also, remove non-POSIX getopt declaration that conflitcts
with musl
https://bugs.gentoo.org/919367
https://bugs.gentoo.org/945292
--- a/gxvattr.c
+++ b/gxvattr.c
@@ -256,7 +256,7 @@
         label = gtk_label_new (xvattr[k].name);
         if (!strcmp(xvattr[k].name, "XV_COLORKEY")) {
           manipulator = gtk_color_selection_new();
-          set_color_widget(manipulator, cur_val);
+          set_color_widget(GTK_OBJECT(manipulator), cur_val);
           property->controller = (GtkObject *) manipulator;
           property->set_widget = set_color_widget;
           if (xvattr[k].flags & XvSettable) {
@@ -269,7 +269,7 @@
 	           xvattr[k].max_value == 1) {
 	  // boolean value, use check button
 	  manipulator = gtk_check_button_new();
-	  set_bool_widget(manipulator, cur_val);
+	  set_bool_widget(GTK_OBJECT(manipulator), cur_val);
           property->controller = (GtkObject *) manipulator;
           property->set_widget = set_bool_widget;
           if (xvattr[k].flags & XvSettable) {
--- a/getopt.h
+++ b/getopt.h
@@ -138,14 +138,7 @@
    `getopt'.  */
 
 #if (defined __STDC__ && __STDC__) || defined __cplusplus
-# ifdef __GNU_LIBRARY__
-/* Many other libraries have conflicting prototypes for getopt, with
-   differences in the consts, in stdlib.h.  To avoid compilation
-   errors, only prototype getopt for the GNU C library.  */
 extern int getopt (int __argc, char *const *__argv, const char *__shortopts);
-# else /* not __GNU_LIBRARY__ */
-extern int getopt ();
-# endif /* __GNU_LIBRARY__ */
 
 # ifndef __need_getopt
 extern int getopt_long (int __argc, char *const *__argv, const char *__shortopts,