Jan Tatje authored May 17, 2018 and Carlo Landmeter committed Aug 01, 2018

enabled svcgssd build flag, applied patch from gentoo to make it
build and wrote another patch to fix segfaults, because musl
returns -1 for sysconf(_SC_GETGR_R_SIZE_MAX), which was not handled
at all, thus allocating a smaller buffer than needed.