Updated debian packaging files

debian/changelog

@@ -1,3 +1,9 @@
+libsdl2 (2.0.4) UNRELEASED; urgency=low
+
+  * Updated SDL to version 2.0.4
+
+ -- Sam Lantinga <slouken@libsdl.org>  Thu, 07 Jan 2016 11:02:39 -0800
+
 libsdl2 (2.0.3) UNRELEASED; urgency=low
 
   * Updated SDL to version 2.0.3

debian/libsdl2-dev.install

@@ -5,4 +5,5 @@ usr/lib/*/libSDL2.a
 usr/lib/*/libSDL2main.a
 usr/lib/*/libSDL2_test.a
 usr/lib/*/pkgconfig/sdl2.pc
+usr/lib/*/cmake/SDL2/sdl2-config.cmake
 usr/share/aclocal/sdl2.m4