nss-myhostname: fix postinst/prerm scripts
${D} is expanded by bitbake which means the postinst looks like this:
sed -e '/^hosts:/s/\s*\<myhostname\>//' \
-e 's/\(^hosts:.*\)\(\<files\>\)\(.*\)\(\<dns\>\)\(.*\)/\1\2 myhostname \3\4\5/' \
-i /build/scratch/angstrom-v2014.12/build/tmp-angstrom_next-eglibc/work/armv5te-angstrom-linux-gnueabi/systemd/1_216+gitAUTOINC+
5d0ae62c66-r0/image/etc/nsswitch.conf
Change ${D} to $D to stop it from being expanded by bitbake.
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
