Update packaging

* New maintainer.
 * Switch to debhelper.
 * Remove d/watch file pointing to a dead site.
 * Don't install .la files.
 * Multiarchify.
 * Remove unneeded dependencies (closes: bug#810434).

debian/libg15render-dev.install

@@ -1,5 +1,4 @@
-debian/tmp/usr/include/* usr/include/
-debian/tmp/usr/lib/lib*.a usr/lib/
-debian/tmp/usr/lib/lib*.so usr/lib/
-debian/tmp/usr/lib/*.la usr/lib/
+debian/tmp/usr/include/*
+debian/tmp/usr/lib/*/lib*.a
+debian/tmp/usr/lib/*/lib*.so