Linux 4.15 syscall changes

Syscall changes in Linux 4.15 compared with 4.14: 1 added, 0 removed.

This is also the first release scanned for riscv64, so syscalls that were already there are not listed as new.

Added in Linux 4.15

SYSCALLDESCRIPTIONARCHITECTURES AND NUMBERS
ARM_get_tls - arm 983046

Same data from the API: https://api.syscall.sh/v2/diff/4.14/4.15