gnu: gnome-todo: Fix build.

* gnu/packages/patches/gnome-todo-delete-esource-duplicate.patch: New file.
* gnu/packages/gnome.scm (gnome-todo)[source]: Add it.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu/local.mk

@@ -999,6 +999,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/gmp-arm-asm-nothumb.patch		\
   %D%/packages/patches/gmp-faulty-test.patch			\
   %D%/packages/patches/gnome-shell-theme.patch			\
+  %D%/packages/patches/gnome-todo-delete-esource-duplicate.patch \
   %D%/packages/patches/gnome-tweaks-search-paths.patch		\
   %D%/packages/patches/gnupg-default-pinentry.patch		\
   %D%/packages/patches/gnutls-skip-trust-store-test.patch	\

gnu/packages/gnome.scm

@@ -8121,7 +8121,9 @@ desktop.  It supports multiple calendars, month, week and year view.")
                                   name "-" version ".tar.xz"))
               (sha256
                (base32
-                "08ygqbib72jlf9y0a16k54zz51sncpq2wa18wp81v46q8301ymy7"))))
+                "08ygqbib72jlf9y0a16k54zz51sncpq2wa18wp81v46q8301ymy7"))
+              (patches
+               (search-patches "gnome-todo-delete-esource-duplicate.patch"))))
     (build-system meson-build-system)
     (arguments
      '(#:glib-or-gtk? #t

gnu/packages/patches/gnome-todo-delete-esource-duplicate.patch

@@ -0,0 +1,7 @@
+--- gnome-todo-3.28.1/plugins/eds/gtd-eds-autoptr.h.orig	2020-05-06 14:20:49.589902539 +0200
++++ gnome-todo-3.28.1/plugins/eds/gtd-eds-autoptr.h	2020-05-06 14:20:54.593919721 +0200
+@@ -25,4 +25,3 @@
+ G_DEFINE_AUTOPTR_CLEANUP_FUNC (ECalComponent, g_object_unref);
+ G_DEFINE_AUTOPTR_CLEANUP_FUNC (ECalComponentId, e_cal_component_free_id);
+ G_DEFINE_AUTOPTR_CLEANUP_FUNC (ECalClient, g_object_unref);
+-G_DEFINE_AUTOPTR_CLEANUP_FUNC (ESource, g_object_unref);