build-sys: Make libsystemd-shared link to libsystemd-daemon

Commit f934051c4d broke the build
because it made libsystemd-shared call sd_listen_fds() which is
defined in libsystemd-daemon.

This is a bit of a contortion because libsystemd-shared.la is a
noinst_LTLIBRARY, but libtool should do the right thing here and emit
DT_NEEDED on libsystemd-daemon.so for things that consume
libsystemd-shared.la.

Makefile.am

@@ -849,6 +849,8 @@ libsystemd_shared_la_SOURCES = \
 	src/shared/calendarspec.c \
 	src/shared/calendarspec.h
 
+libsystemd_shared_la_LIBADD = libsystemd-daemon.la
+
 #-------------------------------------------------------------------------------
 noinst_LTLIBRARIES += \
 	libsystemd-dbus.la