dnsmasq: ensure test and rc order as older than final releases

Opkg treats text after a version number as higher than without:

 ~# opkg compare-versions "2.80rc1" "<<" "2.80"; echo $?
 1
 ~# opkg compare-versions "2.80rc1" ">>" "2.80"; echo $?
 0

This causes opkg not offering final release as upgradable version, and
even refusing to update, since it thinks the installed version is
higher.

This can be mitigated by adding ~ between the version and the text, as ~
will order as less than everything except itself. Since 'r' < 't', to
make sure that test will be treated as lower than rc we add a second ~
before the test tag. That way, the ordering becomes

  2.80~~test < 2.80~rc < 2.80

which then makes opkg properly treat prerelease versions as lower.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>

package/network/services/dnsmasq/Makefile

@@ -8,10 +8,11 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=dnsmasq
-PKG_VERSION:=2.80
+PKG_UPSTREAM_VERSION:=2.80
+PKG_VERSION:=$(subst test,~~test,$(subst rc,~rc,$(PKG_UPSTREAM_VERSION)))
 PKG_RELEASE:=8
 
-PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_UPSTREAM_VERSION).tar.xz
 PKG_SOURCE_URL:=http://thekelleys.org.uk/dnsmasq
 PKG_HASH:=cdaba2785e92665cf090646cba6f94812760b9d7d8c8d0cfb07ac819377a63bb
 
@@ -19,7 +20,7 @@ PKG_LICENSE:=GPL-2.0
 PKG_LICENSE_FILES:=COPYING
 PKG_CPE_ID:=cpe:/a:thekelleys:dnsmasq
 
-PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(BUILD_VARIANT)/$(PKG_NAME)-$(PKG_VERSION)
+PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(BUILD_VARIANT)/$(PKG_NAME)-$(PKG_UPSTREAM_VERSION)
 
 PKG_INSTALL:=1
 PKG_BUILD_PARALLEL:=1