Fix build issue with freerdp2

Gnome-Bug: https://bugzilla.gnome.org/show_bug.cgi?id=765444
Gentoo-Bug: https://bugs.gentoo.org/show_bug.cgi?id=609474

diff --git c/plugins/rdp/vinagre-rdp-tab.c i/plugins/rdp/vinagre-rdp-tab.c
index b731f9b20ec910cc..13100de3dc0e07e1 100644
--- c/plugins/rdp/vinagre-rdp-tab.c
+++ i/plugins/rdp/vinagre-rdp-tab.c
@@ -476,16 +476,17 @@ frdp_drawing_area_draw (GtkWidget *area,
   return TRUE;
 }
 
-static void
+static BOOL
 frdp_begin_paint (rdpContext *context)
 {
   rdpGdi *gdi = context->gdi;
 
   gdi->primary->hdc->hwnd->invalid->null = 1;
   gdi->primary->hdc->hwnd->ninvalid = 0;
+  return TRUE;
 }
 
-static void
+static BOOL
 frdp_end_paint (rdpContext *context)
 {
   VinagreRdpTab        *rdp_tab = ((frdpContext *) context)->rdp_tab;
@@ -495,7 +496,7 @@ frdp_end_paint (rdpContext *context)
   gint                  x, y, w, h;
 
   if (gdi->primary->hdc->hwnd->invalid->null)
-    return;
+    return TRUE;
 
   x = gdi->primary->hdc->hwnd->invalid->x;
   y = gdi->primary->hdc->hwnd->invalid->y;
@@ -517,6 +518,7 @@ frdp_end_paint (rdpContext *context)
     {
       gtk_widget_queue_draw_area (priv->display, x, y, w, h);
     }
+  return TRUE;
 }
 
 static BOOL
@@ -587,15 +589,7 @@ frdp_post_connect (freerdp *instance)
   rdpGdi               *gdi;
   int                   stride;
 
-  gdi_init (instance,
-#if defined(FREERDP_VERSION_MAJOR) && defined(FREERDP_VERSION_MINOR) && \
-    !(FREERDP_VERSION_MAJOR > 1 || (FREERDP_VERSION_MAJOR == 1 && \
-    FREERDP_VERSION_MINOR >= 2))
-                    CLRBUF_24BPP,
-#else
-                    CLRBUF_32BPP,
-#endif
-                    NULL);
+  gdi_init (instance, PIXEL_FORMAT_BGRA32);
   gdi = instance->context->gdi;
 
   instance->update->BeginPaint = frdp_begin_paint;
@@ -934,11 +928,13 @@ frdp_authenticate (freerdp  *instance,
   return TRUE;
 }
 
-static BOOL
+static DWORD
 frdp_certificate_verify (freerdp *instance,
-                         char    *subject,
-                         char    *issuer,
-                         char    *fingerprint)
+                         const char *common_name,
+                         const char *subject,
+                         const char *issuer,
+                         const char *fingerprint,
+                         BOOL host_mismatch)
 {
   VinagreTab *tab = VINAGRE_TAB (((frdpContext *) instance->context)->rdp_tab);
   GtkBuilder *builder;
@@ -968,17 +964,20 @@ frdp_certificate_verify (freerdp *instance,
   gtk_widget_hide (dialog);
 
 
-  return response == GTK_RESPONSE_YES;
+  return (response == GTK_RESPONSE_YES) ? 1 : 0;
 }
 
 
 #if HAVE_FREERDP_1_1
-static BOOL
+static DWORD
 frdp_changed_certificate_verify (freerdp *instance,
-                                 char    *subject,
-                                 char    *issuer,
-                                 char    *new_fingerprint,
-                                 char    *old_fingerprint)
+                                 const char *common_name,
+                                 const char *subject,
+                                 const char *issuer,
+                                 const char *new_fingerprint,
+                                 const char *old_subject,
+                                 const char *old_issuer,
+                                 const char *old_fingerprint)
 {
   VinagreTab *tab = VINAGRE_TAB (((frdpContext *) instance->context)->rdp_tab);
   GtkBuilder *builder;
@@ -1023,7 +1022,7 @@ frdp_changed_certificate_verify (freerdp *instance,
   gtk_widget_hide (dialog);
 
 
-  return response == GTK_RESPONSE_YES;
+  return (response == GTK_RESPONSE_YES) ? 1 : 0;
 }
 #endif