package/mjpg-streamer: bump version

package/mjpg-streamer: bump version

This bump includes

https://github.com/jacksonliam/mjpg-streamer/commit/588db286da461ac5c02277b511ab58a7bf3f752f
https://github.com/jacksonliam/mjpg-streamer/commit/3b7d04d28a39bc697f5bd77f1072430692ac9f8b

which fixes building without c++:

http://autobuild.buildroot.net/results/1da/1da75a9d9b6e4d04d39117d2915c1d195dcae002/
http://autobuild.buildroot.net/results/3da/3da3f4099ccf62a314c099c5720dd5b1e9463914/
http://autobuild.buildroot.net/results/104/10438190453bd7ef7cc157929e74a9ffce9f7fdf/
http://autobuild.buildroot.net/results/91f/91fa80348db0c248649fe003df2dfa854f37a5a2/
http://autobuild.buildroot.net/results/4d7/4d7e722cf85a54d2813715e6b4ca1dd793e6d237/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>