6734f32d91
When running in SDK context, treat the mtd package as shared to reintroduce
the common repository binary package for older released IBs.
When building outside of the SDK, create a nonshared package with a higher
PKG_REVISION to let opkg prefer that over the shared one in the common repo.
Ref: https://forum.lede-project.org/t/17-01-4-opkg-install-cmd-cannot-install-package-mtd/15312
Fixes: aaac9e82aa ("mtd: mark as nonshared to fix FS#484")
Signed-off-by: Jo-Philipp Wich <jo@mein.io>