[vte] widget: Add missing exception specification

[Egmont Koblinger <egmontkob src gnome org>]

commit 4e7fe2f2fc02cc008f67d80ef3cd9b41a8f17129
Author: Egmont Koblinger <egmont gmail com>
Date:   Thu Sep 27 21:25:50 2018 +0200

    widget: Add missing exception specification
    
    This fixes compiling with clang.

 src/widget.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/widget.cc b/src/widget.cc
index 0f2e509e..deaf789d 100644
--- a/src/widget.cc
+++ b/src/widget.cc
@@ -327,7 +327,7 @@ Widget::size_allocate(GtkAllocation* allocation) noexcept
 }
 
 void
-Widget::unmap()
+Widget::unmap() noexcept
 {
         if (m_event_window)
                 gdk_window_hide(m_event_window);