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>