clients: Improve Samsung BD-J5500 support

From SF user Andrea Odetti:

The Samsung BD J5500 player does not accept some of the DLNA_PN values
used by minidlna for *.mp4 files.

For instance AVC_MP4_MP_HD_720p_AAC and AVC_MP4_BL_L31_HD_AAC are
problematic as the player would simply ignore the files and not show
them.

AVC_MP4_HP_HD_AAC works.

All the files play normally from a USB key.

I've noticed as well that NULL works always, and this is the approach I
have followed.

So I changed minidlna and added a flag to disable DLNA_PN, and this
flag is only used for a Samsung BD J5500 in order not to break other
players, which can handle DLNA_PN properly.

So when a J5500 is connected we simply set DLNA_PN to NULL and
everything works well.

clients.h

@@ -37,6 +37,7 @@
 #define FLAG_AUDIO_ONLY         0x00000400
 #define FLAG_FORCE_SORT         0x00000800
 #define FLAG_CAPTION_RES        0x00001000
+#define FLAG_SKIP_DLNA_PN       0x00002000 /* during browsing */
 /* Response-related flags */
 #define FLAG_HAS_CAPTIONS       0x80000000
 #define RESPONSE_FLAGS          0xF0000000
@@ -69,6 +70,7 @@ enum client_types {
 	ESamsungSeriesB,
 	ESamsungSeriesCDEBDP,
 	ESamsungSeriesCDE,
+	ESamsungBDJ5500,
 	ESonyBDP,
 	ESonyBravia,
 	ESonyInternetTV,