Introduced deb packages building tools.

pkg/deb/debian/control

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+Source: unit
+Section: admin
+Priority: extra
+Maintainer: Andrei Belov <defan@nginx.com>
+Build-Depends: debhelper (>= 9),
+               linux-libc-dev
+Standards-Version: 3.9.5
+Homepage: https://unit.nginx.org
+
+Package: unit
+Section: admin
+Architecture: any
+Depends: lsb-base,
+         ${misc:Depends}, ${shlibs:Depends}
+Description: NGINX Unit
+ NGINX Unit is a runtime and delivery environment for modern distributed
+ applications. It runs the application code in multiple languages
+ (PHP, Python, Go, etc.), and tightly couples it with traffic delivery
+ in and out of the application. Take this application server and proxy
+ directly in the cloud / container environments and fully control your app
+ dynamically via an API.
+
+Package: unit-dbg
+Section: debug
+Architecture: any
+Priority: extra
+Depends: unit (= ${binary:Version}),
+         ${misc:Depends}
+Description: NGINX Unit (debug symbols)
+ This package contains the debugging symbols for NGINX Unit.