Support for debian packaging.

This enables creating .deb packages for easy installation on Ubuntu and
Debian.

debian/changelog

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+openrct2 (0.0.4-develop-1) unstable; urgency=medium
+
+  * Initial release. (Closes: #XXXXXX)
+
+ -- Michał Janiszewski <janisozaur+openrct2@gmail.com>  Sun, 10 Jan 2016 23:41:16 +0100

debian/compat

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+9

debian/control

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+Source: openrct2
+Maintainer: Michał Janiszewski <janisozaur+openrct2@gmail.com>
+Section: misc
+Priority: optional
+Standards-Version: 3.9.2
+Multi-Arch: same
+Build-Depends: debhelper (>= 9), cmake, libsdl2-dev, libsdl2-ttf-dev, gcc, pkg-config, g++-multilib, gcc-multilib, libjansson4 (>= 2.7), libjansson-dev (>= 2.7), libspeex-dev, libspeexdsp-dev, libcurl4-openssl-dev, libcrypto++-dev, libfontconfig1-dev, libfreetype6-dev, libpng-dev, libpng16-dev
+
+Package: openrct2
+Architecture: i386
+Homepage: https://openrct2.website/
+Vcs-Browser: https://github.com/OpenRCT2/OpenRCT2
+Vcs-Git: https://github.com/OpenRCT2/OpenRCT2
+Depends: ${shlibs:Depends}, ${misc:Depends}
+Description: An open source re-implementation of Roller Coaster Tycoon 2.
+ An open source clone of RollerCoaster Tycoon 2 built by decompiling the
+ original game one bit at a time.
+ Requires original game assets.

debian/rules

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+#!/usr/bin/make -f
+
+BUILDDIR=build_dir
+
+build:
+	scripts/linux/install.sh
+	mkdir $(BUILDDIR)
+	cd $(BUILDDIR); cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo ..
+	make -C $(BUILDDIR)
+	touch build
+
+%:
+	dh $@

debian/source/format

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+3.0 (quilt)