[libhandy] debian: Fail if introduced symbols are not listed

[Alexander Mikhaylenko <alexm src gnome org>]

commit 3c00e954f708340f22afc9cffc18bede970b7ade
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Wed Jul 1 09:23:06 2020 +0200

    debian: Fail if introduced symbols are not listed
    
    This will help us properly maintain the symbols file.

 debian/rules | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/debian/rules b/debian/rules
index 9e2a59cc..e1f6d223 100755
--- a/debian/rules
+++ b/debian/rules
@@ -11,3 +11,6 @@ override_dh_auto_configure:
 override_dh_auto_test:
        xvfb-run -s -noreset dh_auto_test
 
+override_dh_makeshlibs:
+       dh_makeshlibs --package=libhandy-1-0 -- -c2
+