UBUNTU: [Packaging] remove debian.*/variants

Now 'variants' is no longer used for building packages.

It is true that the 'variants' is used in linux-meta, but there is
no good reason to have it in linux-main.

Only the remaining function is to check the variants from
'debian/rules printenv', but it is not so useful.

Remove it.

Signed-off-by: Masahiro Yamada <masahiro.yamada@canonical.com>
Acked-by: Dimitri John Ledkov <dimitri.ledkov@canonical.com>
Signed-off-by: Dimitri John Ledkov <dimitri.ledkov@canonical.com>

debian.master/variants

@@ -1 +0,0 @@
--wip

debian/rules.d/0-common-vars.mk

@@ -19,12 +19,6 @@ release := $(patsubst %-$(revision),%,$(version))
 prev_fullver ?= $(shell dpkg-parsechangelog -l$(DEBIAN)/changelog -o1 -c1 -S version)
 prev_revision := $(lastword 0.0 $(subst -,$(space),$(prev_fullver)))
 
-# Get variants. Assume primary if debian/variants is not present.
-variants = --
-ifneq (,$(wildcard $(DEBIAN)/variants))
-	variants := $(shell cat $(DEBIAN)/variants)
-endif
-
 # Get upstream version info
 upstream_version := $(shell sed -n 's/^VERSION = \(.*\)$$/\1/p' Makefile)
 upstream_patchlevel := $(shell sed -n 's/^PATCHLEVEL = \(.*\)$$/\1/p' Makefile)

debian/rules.d/1-maintainer.mk

@@ -43,7 +43,6 @@ printenv:
 	@echo "prev_revision             = $(prev_revision)"
 	@echo "abinum                    = $(abinum)"
 	@echo "upstream_tag              = $(upstream_tag)"
-	@echo "variants                  = $(variants)"
 	@echo "flavours                  = $(flavours)"
 	@echo "bin_pkg_name              = $(bin_pkg_name)"
 	@echo "hdr_pkg_name              = $(hdrs_pkg_name)"