Debian: Create package i3-wm-dbg with debug symbols (thanks sur5r)

debian/control

@@ -32,3 +32,12 @@ Description: an improved dynamic tiling window manager
  .
  Please be aware i3 is primarily targeted at advanced users and developers
  and that you're currently trying an alpha version (which may contain bugs).
+
+Package: i3-wm-dbg
+Architecture: any
+Priority: optional
+Section: x11
+Depends: i3-wm (=${Source-Version})
+Description: Debugging symbols for the i3 window manager
+ Debugging symbols for the i3 window manager. Please install this to produce
+ useful backtraces before creating new tickets.

debian/rules

@@ -68,7 +68,7 @@ binary-arch: build install
 #	dh_installinfo
 	dh_installman
 	dh_link
-	dh_strip
+	dh_strip --dbg-package=i3-wm-dbg
 	dh_compress
 	dh_fixperms
 #	dh_perl