FreeBSD/src 7dabf89 (r345469) — sys/amd64/linux32 linux32_machdep.c syscalls.master, sys/compat/linux linux_ipc.c linux_ipc.h
Linux between 4.18 and 5.0 split IPC system calls. In preparation for doing this in the Linuxulator modify our linux_shmat() to match actual Linux shmat() system call. MFC after: 1 month