Fixed format warning

[radarhere]

Helps #5526

In master at the moment, there is a warning at https://github.com/python-pillow/Pillow/runs/2757774272?check_suite_focus=true#step:9:112

src/libImaging/TiffDecode.c:59:60: warning: format ‘%llu’ expects argument of type ‘long long unsigned int’, but argument 3 has type ‘toff_t’ {aka ‘long unsigned int’} [-Wformat=]
   59 |         TIFFError("_tiffReadProc", "Invalid Read at loc %llu, eof: %llu", state->loc, state->eof);

If I try to fix that by changing it to '%lu', it fixes that job, but starts failing in another -

src/libImaging/TiffDecode.c:59:73: warning: format specifies type 'unsigned long' but the argument has type 'toff_t' (aka 'unsigned long long') [-Wformat]
        TIFFError("_tiffReadProc", "Invalid Read at loc %lu, eof: %lu", state->loc, state->eof);

So instead, this PR casts the arguments to unsigned long long.

[kmilos]

Perhaps it's neater to use platform agnostic macros from inttypes.h that correspond to uint64_t (i.e. %PRIu64) now that libtiff switched to standard types as well?

[radarhere]

Feel free to show that I'm doing it wrong, but if I try that, I see https://github.com/radarhere/Pillow/runs/2798905046?check_suite_focus=true#step:9:112

src/libImaging/TiffDecode.c:60:58: warning: unknown conversion type character ‘P’ in format [-Wformat=]
   60 |         TIFFError("_tiffReadProc", "Invalid Read at loc %PRlu64, eof: %PRlu64", state->loc, state->eof);

[kmilos]

I think you use it w/ concatenation, like

TIFFError("_tiffReadProc", "Invalid Read at loc %" PRIu64 ", eof: %" PRIu64, state->loc, state->eof);

(note the capital "i" in PRI as in print, not small case "L")

And probably no need to explicitly include inttypes.h, tiffio.h (tiffconf.h) already pulls it in for you...