perf trace beauty: Export the "int" and "hex" syscall arg formatters

The most basic ones, for pointers, unaugmented fds, etc, to be used
in the initial fcntl 'arg' beautifier.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-g0lugj4vv6p4jtge32hid6q6@git.kernel.org


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>