rootfs_rpm: Setup the platform configuration

The RPM platform configuration file lists all of the supported architectures,
while RPM itself doesn't use this information, other tools may use it to
determine compatibility.  The first item is the default architecture for a
system, while the following items specify alternative compatible architectures.

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>

meta/classes/rootfs_rpm.bbclass

@@ -39,7 +39,13 @@ fakeroot rootfs_rpm_do_rootfs () {
 
 	# Setup base system configuration
 	mkdir -p ${IMAGE_ROOTFS}/etc/rpm/
-	echo "${TARGET_ARCH}-linux" >${IMAGE_ROOTFS}/etc/rpm/platform
+
+	# Default arch is the top..
+	echo "${TARGET_ARCH}-unknown-linux" >${IMAGE_ROOTFS}/etc/rpm/platform
+	# Add the rest in sort order..
+	for each in ${PACKAGE_ARCHS} ; do
+		echo "$each""-unknown-linux" >>${IMAGE_ROOTFS}/etc/rpm/platform
+	done
 
 	# Tell RPM that the "/" directory exist and is available
 	mkdir -p ${IMAGE_ROOTFS}/etc/rpm/sysinfo