[gnome-builder] plugins/meson-templates: more fixes for C++

[Christian Hergert <chergert src gnome org>]

commit 01a2ad66f0d8caa164b0844b8e72d864681832b4
Author: Christian Hergert <chergert redhat com>
Date:   Sun Mar 27 13:45:14 2022 -0700

    plugins/meson-templates: more fixes for C++
    
    I personally don't think the C++ stuff is in all that good of shape if we
    keep having to do duplicates of all these libraries. But it is what it is.

 .../meson-templates/resources/flatpak.json.in      | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
---
diff --git a/src/plugins/meson-templates/resources/flatpak.json.in 
b/src/plugins/meson-templates/resources/flatpak.json.in
index 997a610bd..e4659f508 100644
--- a/src/plugins/meson-templates/resources/flatpak.json.in
+++ b/src/plugins/meson-templates/resources/flatpak.json.in
@@ -58,6 +58,17 @@
                }
            ]
         },
+        {
+            "name" : "sigc++-2",
+            "buildsystem" : "meson",
+            "sources" : [
+                {
+                    "type" : "archive",
+                    "url" : "https://download.gnome.org/sources/libsigc++/2.10/libsigc++-2.10.8.tar.xz";,
+                    "sha256" : "235a40bec7346c7b82b6a8caae0456353dc06e71f14bc414bcc858af1838719a"
+                }
+            ]
+        },
         {
             "name" : "sigc++",
             "buildsystem" : "meson",
@@ -82,6 +93,17 @@
                 }
             ]
         },
+        {
+            "name" : "cairomm",
+            "buildsystem" : "meson",
+            "sources" : [
+                {
+                    "type" : "archive",
+                    "url" : "https://cairographics.org/releases/cairomm-1.14.3.tar.xz";,
+                    "sha256" : "0d37e067c5c4ca7808b7ceddabfe1932c5bd2a750ad64fb321e1213536297e78"
+                }
+            ]
+        },
         {
             "name" : "cairomm",
             "buildsystem" : "meson",