debian: release 0.21~rc3-3

Build-conflict with gdb-minimal, since there is no gdb-python to depend
on

debian/changelog

@@ -1,3 +1,10 @@
+notmuch (0.21~rc3-3) experimental; urgency=medium
+
+  * Build-conflict with gdb-minimal. gdb python scripts are needed for
+    the test suite
+
+ -- David Bremner <bremner@debian.org>  Sun, 25 Oct 2015 22:08:56 -0300
+
 notmuch (0.21~rc3-2) experimental; urgency=medium
 
   * Bug fix: "reply-to encrypted messages in tree view fails to quote

debian/control

@@ -5,7 +5,7 @@ Maintainer: Carl Worth <cworth@debian.org>
 Uploaders:
  Jameson Graef Rollins <jrollins@finestructure.net>,
  David Bremner <bremner@debian.org>
-Build-Conflicts: ruby1.8
+Build-Conflicts: ruby1.8, gdb-minimal
 Build-Depends:
  debhelper (>= 9),
  pkg-config,