st/omx: use makefile.sources to handle sources lists

... and add the headers so that 'make check' is happy.

Cc: Christian König <christian.koenig@amd.com>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Christian König <christian.koenig@amd.com>

src/gallium/state_trackers/omx/Makefile.am

@@ -20,6 +20,7 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 # DEALINGS IN THE SOFTWARE.
 
+include Makefile.sources
 include $(top_srcdir)/src/gallium/Automake.inc
 
 AM_CFLAGS = \
@@ -29,9 +30,4 @@ AM_CFLAGS = \
 
 noinst_LTLIBRARIES = libomxtracker.la
 
-libomxtracker_la_SOURCES = \
-	entrypoint.c \
-	vid_dec.c \
-	vid_dec_mpeg12.c \
-	vid_dec_h264.c \
-	vid_enc.c
+libomxtracker_la_SOURCES = $(C_SOURCES)

src/gallium/state_trackers/omx/Makefile.sources

@@ -0,0 +1,9 @@
+C_SOURCES := \
+	entrypoint.c \
+	entrypoint.h \
+	vid_dec.c \
+	vid_dec.h \
+	vid_dec_mpeg12.c \
+	vid_dec_h264.c \
+	vid_enc.c \
+	vid_enc.h