build-sys: "link" python _reader and pam_systemd against libsd-daemon-internal

The same old story as d3b9e0ff: those two use libsystemd-shared, and
in turn, some functions in libsystemd-shared use libsystemd-daemon.
The fact that *those* functions are used neither by the python modules
in question nor pam_systemd isn't always enough. Currently, I'm seeing
linking failures with -flto. The result of adding
libsystemd-daemon-internal to the list of linked libraries should be
harmless, with no change in size or final link requirements.

Makefile.am

@@ -3597,6 +3597,7 @@ pam_systemd_la_LIBADD = \
 	libsystemd-audit.la \
 	libsystemd-dbus.la \
 	libsystemd-shared.la \
+	libsystemd-daemon-internal.la \
 	$(PAM_LIBS)
 
 pamlib_LTLIBRARIES = \
@@ -3776,7 +3777,8 @@ _reader_la_LIBADD = \
 	$(PYTHON_LIBS) \
 	libsystemd-journal.la \
 	libsystemd-id128.la \
-	libsystemd-shared.la
+	libsystemd-shared.la \
+	libsystemd-daemon-internal.la
 
 dist_pkgpyexec_PYTHON = \
 	src/python-systemd/journal.py \