Problem: useless call to pkg-config for systemd-units
Problem: useless call to pkg-config for systemd-units

Solution: simply use AC_DEFINE and AC_SUBST, since it's only used to
pass defines to the generated Makefile.am, it does not need to find
cflags/ldflags

zeromq/zproject,hintjens/zproject,eburkitt/zproject,keent/zproject,twhittock/zproject,hintjens/zproject,paddor/zproject,zeromq/zproject,keent/zproject,paddor/zproject,taotetek/zproject,twhittock/zproject,zeromq/zproject,taotetek/zproject,paddor/zproject,eburkitt/zproject,taotetek/zproject