[glom/gtkmm4v4] gtkmm4: Adapt to change cairomm enums.

[Murray Cumming <murrayc src gnome org>]

commit 60197485bc867383fbb4a9f09e5509c0abe39caf
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Apr 19 20:53:24 2017 +0200

    gtkmm4: Adapt to change cairomm enums.

 glom/utility_widgets/flowtable.cc |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/glom/utility_widgets/flowtable.cc b/glom/utility_widgets/flowtable.cc
index 4f76590..9c36782 100644
--- a/glom/utility_widgets/flowtable.cc
+++ b/glom/utility_widgets/flowtable.cc
@@ -248,8 +248,8 @@ bool FlowTable::on_draw(const Cairo::RefPtr<Cairo::Context>& cr)
     return true;
 
   cr->set_line_width(1);
-  cr->set_line_cap(Cairo::LINE_CAP_SQUARE);
-  cr->set_line_join(Cairo::LINE_JOIN_MITER);
+  cr->set_line_cap(Cairo::Context::LineCap::SQUARE);
+  cr->set_line_join(Cairo::Context::LineJoin::MITER);
   std::vector<double> dashes;
   dashes.emplace_back(10);
   cr->set_dash(dashes, 0);