systemd: Upgrade to 187 tag

Dont inherit vala not needed anymore

Fix build for ppc64

Consider /lib64 and /usr/lib64

Some 64bit architectures chose lib64 instead of lib
for default library dirnames. So we dig this from metadata
vars base_libdir and libdir instead of hardcoding 'lib'

ppc64 in OE uses lib64 for default libdir
and this leaves lot of udev/systemd
files unpackaged since 'lib' was hardcoded

Additionally use --split-usr option since
in OE-Core now we want to treat /usr mounted
sepatately.

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>