/usr/share/gdb/syscalls/ is in gdb-python2 7.12-6.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gdb/syscalls/aarch64-linux.xml
/usr/share/gdb/syscalls/amd64-linux.xml
/usr/share/gdb/syscalls/arm-linux.xml
/usr/share/gdb/syscalls/freebsd.xml
/usr/share/gdb/syscalls/gdb-syscalls.dtd
/usr/share/gdb/syscalls/i386-linux.xml
/usr/share/gdb/syscalls/mips-n32-linux.xml
/usr/share/gdb/syscalls/mips-n64-linux.xml
/usr/share/gdb/syscalls/mips-o32-linux.xml
/usr/share/gdb/syscalls/ppc-linux.xml
/usr/share/gdb/syscalls/ppc64-linux.xml
/usr/share/gdb/syscalls/s390-linux.xml
/usr/share/gdb/syscalls/s390x-linux.xml
/usr/share/gdb/syscalls/sparc-linux.xml
/usr/share/gdb/syscalls/sparc64-linux.xml