db: Convert to BBCLASSEXTEND

Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

meta/packages/db/db-native_4.2.52.bb

@@ -1,11 +0,0 @@
-# This wrapper builds a native version of the SleepyCat
-# Berkeley DB for those packages which need it (e.g.
-# perl).
-SECTION = "libs"
-VIRTUAL_NAME = "virtual/db-native"
-CONFLICTS = "db3-native"
-#PR tracks the non-native package
-
-require db_${PV}.bb
-
-inherit native

meta/packages/db/db_4.2.52.bb

@@ -12,8 +12,11 @@ SECTION = "libs"
 DESCRIPTION = "Berkeley DB v4."
 HOMEPAGE = "http://www.oracle.com/technology/products/berkeley-db/db/index.html"
 LICENSE = "BSD Sleepycat"
-VIRTUAL_NAME ?= "virtual/db"
+VIRTUAL_NAME = "virtual/db"
+VIRTUAL_NAME_virtclass-native = "virtual/db-native"
+
 CONFLICTS = "db3"
+CONFLICTS_virtclass-native = "db3-native"
 PR = "r8"
 
 SRC_URI = "http://download.oracle.com/berkeley-db/db-${PV}.tar.gz \
@@ -90,3 +93,5 @@ do_install_append() {
 
 # The db package contains symlinks that trip up insane
 INSANE_SKIP_db = "1"
+
+BBCLASSEXTEND = "native"