[libdmapsharing] Fix build with --disable-tests --disable-check

[W. Michael Petullo <wmpetullo src gnome org>]

commit 7b6892b1b8f22fd66bc76293f3fdadfc216bb2f4
Author: W. Michael Petullo <mike flyn org>
Date:   Mon Oct 9 16:50:05 2017 -0400

    Fix build with --disable-tests --disable-check
    
    Signed-off-by: W. Michael Petullo <mike flyn org>

 libdmapsharing/Makefile.am |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/libdmapsharing/Makefile.am b/libdmapsharing/Makefile.am
index 5660e51..902dd09 100644
--- a/libdmapsharing/Makefile.am
+++ b/libdmapsharing/Makefile.am
@@ -107,9 +107,9 @@ noinst_HEADERS = \
        dmap-gst-wav-input-stream.h \
        gst-util.h
 
-BUILT_SOURCES = dmap-marshal.c dmap-marshal.h dmap-enums.c dmap-enums.h ../tests/unit-test.c
+BUILT_SOURCES = dmap-marshal.c dmap-marshal.h dmap-enums.c dmap-enums.h unit-test.stamp
 
-CLEANFILES = $(BUILT_SOURCES)
+CLEANFILES = $(BUILT_SOURCES) ../tests/unit-test.c
 
 dmap-marshal.c: dmap-marshal.list
        @glib-genmarshal --prefix=dmap_marshal $(srcdir)/dmap-marshal.list --header --body > dmap-marshal.c
@@ -137,9 +137,10 @@ dmap-enums.h: $(libdmapsharinginclude_HEADERS) Makefile
        && sed -e "s/d_map/dmap/" -e "s/D_MAP/DMAP/" -e "s/d_acp/dacp/" -e "s/D_ACP/DACP/" $@.tmp > $@ \
        && rm -f $@.tmp
 
-../tests/unit-test.c: $(grep -l START_TEST *.c)
+unit-test.stamp: $(grep -l START_TEST *.c)
        ./generate-test-suites
        mv unit-test.c ../tests
+       touch unit-test.stamp
 
 if HAVE_INTROSPECTION
 include $(INTROSPECTION_MAKEFILE)