[Testsuite] getpid in gcc.c-torture/execute/pr58419.c

[Senthil Kumar Selvaraj]

All,

  gcc.c-torture/execute/pr58419.c has a call to getpid, and this causes
  a linker error on the AVR (embedded) target. Is the call intentional,
  and if yes, how should this be fixed for targets that don't support an
  OS?

Regards
Senthil