spl/debian: add packaging files

based on Debian's packaging work, but simplified:
- no DKMS

and remove old patches which were based on top of Debian's packaging.

Reviewed-by: Stoiko Ivanov <s.ivanov@proxmox.com>
Tested-by: Stoiko Ivanov <s.ivanov@proxmox.com>
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

spl/debian/rules

@@ -0,0 +1,33 @@
+#!/usr/bin/make -f
+
+include /usr/share/dpkg/pkg-info.mk
+
+VERSION := $(DEB_VERSION_UPSTREAM)
+REVISION := $(shell echo $(DEB_VERSION) | cut -d- -f2)
+
+export DEB_BUILD_MAINT_OPTIONS = hardening=+all
+
+%:
+	dh $@ --with autoreconf --parallel
+
+override_dh_auto_configure:
+	@# Embed the downstream version in the module.
+	@sed \
+	  -e 's/^Version:.*/Version:      $(VERSION)/' \
+	  -e 's/^Release:.*/Release:      $(REVISION)/' \
+	  -i.orig META
+
+	@# Build the userland, but don't build the kernel modules.
+	dh_auto_configure -- --with-config=user --disable-debug-kmem
+
+override_dh_auto_test:
+	# scripts/check.sh tries insmod and rmmod, so it cannot
+	# run in an unprivileged build environment.
+
+override_dh_auto_install:
+	@# Install the utilities.
+	$(MAKE) install DESTDIR='$(CURDIR)/debian/tmp'
+
+override_dh_auto_clean:
+	dh_auto_clean
+	@if test -e META.orig; then mv META.orig META; fi