GTK1 build fixes.

Looks as if I haven't retried the GTK1 build for a while, and recent
GTK frontend development has broken it. The selection revamp has
pointed out that GTK1 didn't have the accessor function
gtk_selection_data_get_selection(), the standard GdkAtom value
GDK_SELECTION_CLIPBOARD, or keysyms for alphabetic characters; and
also I had an initialisation of one of my own structure fields
(dp->selparams) accidentally not guarded by the same GTK-versioning
ifdef that controls whether or not it was defined.

unix/gtkcompat.h

@@ -65,6 +65,7 @@
 #define gtk_adjustment_set_page_increment(a, val) ((a)->page_increment = (val))
 #define gtk_adjustment_set_step_increment(a, val) ((a)->step_increment = (val))
 #define gtk_adjustment_get_value(a) ((a)->value)
+#define gtk_selection_data_get_selection(a) ((a)->selection)
 
 #define gtk_widget_set_has_window(w, b)                 \
     gtk1_widget_set_unset_flag(w, GTK_NO_WINDOW, !(b))
@@ -83,6 +84,11 @@
  * return the GDK default display. */
 #define GDK_DISPLAY_XDISPLAY(x) GDK_DISPLAY()
 
+#define GDK_KEY_C                    ('C')
+#define GDK_KEY_V                    ('V')
+#define GDK_KEY_c                    ('c')
+#define GDK_KEY_v                    ('v')
+
 #endif /* 2.0 */
 
 #if !GTK_CHECK_VERSION(2,22,0)

unix/gtkdlg.c

@@ -3416,7 +3416,12 @@ GtkWidget *create_message_box(
     gtk_widget_show(window);
     gtk_window_set_focus(GTK_WINDOW(window), NULL);
 
+#if !GTK_CHECK_VERSION(2,0,0)
+    dp->currtreeitem = NULL;
+    dp->treeitems = NULL;
+#else
     dp->selparams = NULL;
+#endif
 
     g_signal_connect(G_OBJECT(window), "destroy",
                      G_CALLBACK(dlgparam_destroy), dp);

unix/gtkwin.c

@@ -51,6 +51,11 @@
 #define NALLCOLOURS (NCFGCOLOURS + NEXTCOLOURS)
 
 GdkAtom compound_text_atom, utf8_string_atom;
+GdkAtom clipboard_atom
+#if GTK_CHECK_VERSION(2,0,0) /* GTK1 will have to fill this in at startup */
+    = GDK_SELECTION_CLIPBOARD
+#endif
+    ;
 
 #ifdef JUST_USE_GTK_CLIPBOARD_UTF8
 /*
@@ -2689,7 +2694,7 @@ void set_clipboard_atom(struct gui_data *inst, int clipboard, GdkAtom atom)
 int init_clipboard(struct gui_data *inst)
 {
     set_clipboard_atom(inst, CLIP_PRIMARY, GDK_SELECTION_PRIMARY);
-    set_clipboard_atom(inst, CLIP_CLIPBOARD, GDK_SELECTION_CLIPBOARD);
+    set_clipboard_atom(inst, CLIP_CLIPBOARD, clipboard_atom);
     return TRUE;
 }
 
@@ -3233,7 +3238,7 @@ void init_clipboard(struct gui_data *inst)
 #endif
 
     inst->clipstates[CLIP_PRIMARY].atom = GDK_SELECTION_PRIMARY;
-    inst->clipstates[CLIP_CLIPBOARD].atom = GDK_SELECTION_CLIPBOARD;
+    inst->clipstates[CLIP_CLIPBOARD].atom = clipboard_atom;
     init_one_clipboard(inst, CLIP_PRIMARY);
     init_one_clipboard(inst, CLIP_CLIPBOARD);
 
@@ -4999,6 +5004,8 @@ void new_session_window(Conf *conf, const char *geometry_string)
         compound_text_atom = gdk_atom_intern("COMPOUND_TEXT", FALSE);
     if (!utf8_string_atom)
         utf8_string_atom = gdk_atom_intern("UTF8_STRING", FALSE);
+    if (!clipboard_atom)
+        clipboard_atom = gdk_atom_intern("CLIPBOARD", FALSE);
 
     inst->area = gtk_drawing_area_new();
     gtk_widget_set_name(GTK_WIDGET(inst->area), "drawing-area");