rtmpdump: bump version

Rtmpdump was not compatible with BR's version of PolarSSL, the bump
fixes that.

Fixes:
http://autobuild.buildroot.net/results/55bda4076af031db9778d97f9ddc5c6b14de17ce
http://autobuild.buildroot.net/results/9ba2f8ecb0a73cc7e625faf713ad4161202b2293
http://autobuild.buildroot.net/results/4e1988f049fa97574da54e5097e5ef1668c2687c
http://autobuild.buildroot.net/results/02a15ad5211a1e620002c442ce256147d9b9ee88

Signed-off-by: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/rtmpdump/rtmpdump.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-RTMPDUMP_VERSION = e0056c51cc1710c9a44d2a2c4e2f344fa9cabcf4
+RTMPDUMP_VERSION = dc76f0a8461e6c8f1277eba58eae201b2dc1d06a
 RTMPDUMP_SITE = git://git.ffmpeg.org/rtmpdump
 RTMPDUMP_INSTALL_STAGING = YES
 # Note that rtmpdump is GPLv2 but librtmp has its own license and since we only