Changes

tests: fix for debian 13 armv7l

In Debian 13 armv7l, time_t and suseconds_t are "long long int" instead
of "long unsigned int" as seen on x86_64 and aarch64. This causes the
the tdef, time_cc and iuup tests to fail. Example:

  -sys={0.000000}, clock_override_set
  +sys={4206924.000000}, (null)
   _tinit_timeout_retrans_transport_prim_cb()
   Transport: DL len=22: e0 00 df 99 16 00 51 67 3c 01 27 00 00 82 00 00 00 17 10 00 01 00
  -sys={1.000000}, clock_override_set
  +sys={4206924.000001}, (null)
   _tinit_timeout_retrans_transport_prim_cb()
   Transport: DL len=22: e0 00 df 99 16 00 51 67 3c 01 27 00 00 82 00 00 00 17 10 00 01 00
  -sys={2.000000}, clock_override_set
  +sys={4206924.000002}, (null)
  …

Furthermore it causes compiler warnings such as:

  iuup/iuup_test.c: In function 'clock_override_set':
  iuup/iuup_test.c:169:24: warning: format '%lu' expects argument of type 'long unsigned int', but argument 2 has type '__time64_t' {aka 'long long int'} [-Wformat=]
    169 |         printf("sys={%lu.%06lu}, %s\n", osmo_gettimeofday_override_time.tv_sec,
        |                      ~~^                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        |                        |                                               |
        |                        long unsigned int                               __time64_t {aka long long int}
        |                      %llu
  iuup/iuup_test.c:169:30: warning: format '%lu' expects argument of type 'long unsigned int', but argument 3 has type '__suseconds64_t' {aka 'long long int'} [-Wformat=]
    169 |         printf("sys={%lu.%06lu}, %s\n", osmo_gettimeofday_override_time.tv_sec,
        |                          ~~~~^
        |                              |
        |                              long unsigned int
        |                          %06llu
    170 |                 osmo_gettimeofday_override_time.tv_usec, __func__);
        |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        |                                                |
        |                                                __suseconds64_t {aka long long int}
    CCLD     iuup/iuup_test

Fix it by casting to "long unsigned int".

Related: OS#6828
Change-Id: I9580606d66bb0f891c0ef0179f99e2b901a8cf1c