misc: fix some printf format strings

misc: fix some printf format strings

Fix the warnings below for OSX clang and add a few more
casts for timeval:

lib/at.c:131:27: warning: format specifies type 'intmax_t' (aka 'long') but the argument has type 'off_t' (aka 'long long') [-Wformat]

                        printf("%16jd bytes ", st.st_size);

                                ~~~~~          ^~~~~~~~~~

lib/strutils.c:522:52: warning: format specifies type 'intmax_t' (aka 'long') but the argument has type 'uint64_t' (aka 'unsigned long long') [-Wformat]

                snprintf(buf, sizeof(buf), "%d%s%jd%s", dec, dp, frac, suffix);

                                                ~~~              ^~~~

lib/sysfs.c:468:42: warning: format specifies type 'uintmax_t' (aka 'unsigned long') but the argument has type 'uint64_t' (aka 'unsigned long long') [-Wformat]

        len = snprintf(buf, sizeof(buf), "%ju", num);

                                          ~~~   ^~~

libuuid/src/gen_uuid.c:316:34: warning: format specifies type 'unsigned long' but the argument has type '__darwin_suseconds_t' (aka 'int') [-Wformat]

                              clock_seq, last.tv_sec, last.tv_usec, adjustment);

                                                      ^~~~~~~~~~~~

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>