Don't run dh_strip when building Debian packages.

We almost never want to remove debugging symbols as they're extremely
useful for debugging issues in the wild and they don't come at really
any cost.

build/debian/rules

@@ -118,7 +118,8 @@ binary-arch: build install
 #	dh_installinfo
 	dh_installman mixxx.1
 	dh_link
-	dh_strip
+# We don't want our binaries stripped.
+#	dh_strip
 	dh_compress -Xpdf
 	dh_fixperms
 #	dh_perl