Moving libmkv library to third_party folder.

Change-Id: Id0bfaedf54ff3f59d4cf361c170a0b5a5711e5f2

examples.mk

@@ -40,9 +40,9 @@ vpxenc.SRCS                 += tools_common.c tools_common.h
 vpxenc.SRCS                 += vpx_ports/mem_ops.h
 vpxenc.SRCS                 += vpx_ports/mem_ops_aligned.h
 vpxenc.SRCS                 += vpx_ports/vpx_timer.h
-vpxenc.SRCS                 += libmkv/EbmlIDs.h
-vpxenc.SRCS                 += libmkv/EbmlWriter.c
-vpxenc.SRCS                 += libmkv/EbmlWriter.h
+vpxenc.SRCS                 += third_party/libmkv/EbmlIDs.h
+vpxenc.SRCS                 += third_party/libmkv/EbmlWriter.c
+vpxenc.SRCS                 += third_party/libmkv/EbmlWriter.h
 vpxenc.SRCS                 += $(LIBYUV_SRCS)
 vpxenc.GUID                  = 548DEC74-7A15-4B2B-AFC3-AA102E7C25C1
 vpxenc.DESCRIPTION           = Full featured encoder

vpxenc.c

@@ -45,8 +45,8 @@
 #include "vpx_ports/vpx_timer.h"
 #include "tools_common.h"
 #include "y4minput.h"
-#include "libmkv/EbmlWriter.h"
-#include "libmkv/EbmlIDs.h"
+#include "third_party/libmkv/EbmlWriter.h"
+#include "third_party/libmkv/EbmlIDs.h"
 #include "third_party/libyuv/include/libyuv/scale.h"
 
 /* Need special handling of these functions on Windows */