No special changes, just get in sync with recent code.
See here for the changelog:
https://valgrind.org/docs/manual/dist.news.html
The ipkg sizes changes as follows for mips 24kc :
3.15 : valgrind_3.15.0-2_mips_24kc.ipk 1450680
3.16.1 : valgrind_3.16.1-1_mips_24kc.ipk 1491954
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>