main: Don't hardcode fingerprint storage directory

It used to be hard-coded to /var/lib/fprint, but is now set to
$(localstatedir)/lib/fprint/.

src/Makefile.am

@@ -7,7 +7,13 @@ EXTRA_DIST = manager.xml device.xml fprintd-marshal.list
 libexec_PROGRAMS = fprintd
 noinst_LTLIBRARIES = libfprintd.la
 
-AM_CFLAGS = $(WARN_CFLAGS) $(FPRINT_CFLAGS) $(DAEMON_CFLAGS) -DLOCALEDIR=\""$(datadir)/locale"\" -DPLUGINDIR=\""$(libdir)/fprintd/modules"\"
+AM_CFLAGS =						\
+	$(WARN_CFLAGS)					\
+	$(FPRINT_CFLAGS)				\
+	$(DAEMON_CFLAGS)				\
+	-DLOCALEDIR=\""$(datadir)/locale"\"		\
+	-DPLUGINDIR=\""$(libdir)/fprintd/modules"\"	\
+	-DFILE_STORAGE_PATH=\""$(localstatedir)/lib/fprint"\"
 
 libfprintd_la_SOURCES =				\
 	manager.c device.c			\