libmkv: fix Makefile.

Update the local makefile to build all the files and the test
application by default to simplify build verification.

Change-Id: Ic10141ea14c85110ff7507447d16297b77d296e9

third_party/libmkv/Makefile

 #Variables
 CC=gcc
 LINKER=gcc
-FLAGS=
+FLAGS=-g -Wall
 
+all: testlibmkv
 
 #Build Targets
 EbmlWriter.o: EbmlWriter.c EbmlWriter.h
@@ -10,16 +11,15 @@ EbmlWriter.o: EbmlWriter.c EbmlWriter.h
 
 EbmlBufferWriter.o: EbmlBufferWriter.c EbmlBufferWriter.h
 	$(CC) $(FLAGS) -c EbmlBufferWriter.c
-	
-MkvElement.o: MkvElement.c WebMElement.h
-	$(CC) $(FLAGS) -c MkvElement.c
-	
+
+WebMElement.o: WebMElement.c WebMElement.h
+	$(CC) $(FLAGS) -c WebMElement.c
+
 testlibmkv.o: testlibmkv.c
 	$(CC) $(FLAGS) -c testlibmkv.c
-	
-testlibmkv: testlibmkv.o MkvElement.o EbmlBufferWriter.o EbmlWriter.o
-	$(LINKER) $(FLAGS) testlibmkv.o MkvElement.o EbmlBufferWriter.o EbmlWriter.o -o testlibmkv
+
+testlibmkv: testlibmkv.o WebMElement.o EbmlBufferWriter.o EbmlWriter.o
+	$(LINKER) $(FLAGS) -o testlibmkv testlibmkv.o WebMElement.o EbmlBufferWriter.o EbmlWriter.o
 
 clean:
 	rm -rf *.o testlibmkv
-	
\ No newline at end of file