Introduce format string for pid_t

Introduce format string for pid_t

BeOS and Haiku on i386 use long for 32-bit types, including pid_t.
Using %d with pid_t therefore results in a warning.

Unfortunately POSIX:2008 does not define a PRId* string for pid_t.

In some places pid_t was previously casted to long and %ld hardcoded.
The predecessor of this patch added another upcast for the simpletrace
filename but was not applied to date.

Since new uses of pid_t with %d keep creeping in, let's instead define
an OS-dependent format string and use that consistently.

Cc: Stefan Hajnoczi <[email protected]>
Cc: Blue Swirl <[email protected]>
Cc: Ingo Weinhold <[email protected]>
Cc: Gleb Natapov <[email protected]>
Signed-off-by: Andreas Färber <[email protected]>
Signed-off-by: Blue Swirl <[email protected]>