change naming to <name>_<version>_<arch>.apk
OpenWrt allows dashes in package names but no underlines. The current
cleanup mechanism in the build system uses those underlines to find
suiting packages to cleanup via <pkgname>_*.apk
.
Also add the package architecture to package filenames. This allows a better overview when downloading packages manually i.e. from a CI.
Signed-off-by: Paul Spooren mail@aparcar.org