Debian packaging: drop debug package

The build hosts generate -dbgsym packages automatically with newer
versions of debhelper.

debian/control

@@ -23,14 +23,3 @@ Description: friendly interactive shell
  Fish is a command-line shell for modern systems, focusing on user-friendliness,
  sensibility and discoverability in interactive use. The syntax is simple, but
  not POSIX compliant.
-
-Package: fish-dbg
-Architecture: any
-Section: debug
-Depends: fish (= ${binary:Version}), ${misc:Depends}
-Description: debugging symbols for friendly interactive shell
- Fish is a command-line shell for modern systems, focusing on user-friendliness,
- sensibility and discoverability in interactive use. The syntax is simple, but
- not POSIX compliant.
- .
- This package contains the debugging symbols for fish.

debian/fish.install

@@ -1,3 +0,0 @@
-debian/tmp/usr/bin
-debian/tmp/etc
-debian/tmp/usr/share

debian/rules

@@ -15,8 +15,3 @@ override_dh_auto_configure:
 # Build fish_tests/tests_buildroot_target by hand (remove this once Ubuntu Xenial is out of support)
 override_dh_auto_build:
 	dh_auto_build -- all fish_tests tests_buildroot_target
-
-# Still needed until all platforms have debhelper 9.20151219
-# Consider transitioning https://wiki.debian.org/DebugPackage
-override_dh_strip:
-	dh_strip --dbg-package=fish-dbg