ipset: fix musl build
Add upstream patch removing use of non-standard u_int8_t type.
Fixes:
http://autobuild.buildroot.net/results/126/
126c97db87cd3bdc6d222982a53d871387cc9b50/
http://autobuild.buildroot.net/results/22d/
22dcb72e75d1844828ba344f5ed126de06d2ab82/
http://autobuild.buildroot.net/results/b56/
b56a6e3b5036c10f2f2b74e36c130d751b2c1312/
Cc: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>