Also fix a new compilation error, due to upstream changes in the build
system. SUBDIRS= is deprecated when building external kernel modules, use
M= instead to fix compilation.
Signed-off-by: Baptiste Jonglez <git@bitsofnetworks.org>
OpenWRT/LEDE only understands the PKG_MD5SUM variable, and detects if the
hash is e.g. SHA256 by looking at the length of the hash.
This affects libs/libmicrohttpd, mail/ssmtp and utils/mc.
Signed-off-by: Baptiste Jonglez <git@bitsofnetworks.org>