update-mime-database seens to have a problem on 32 bit architectures.

update-mime-database.c, l839
"mask = strtol(in_mask, &end, 0)"  can make an overflow

to expose the overflow:

#include <stdio.h>

int main(int argc, char *argv[]) {
  printf("%lx\n", strtol("0x8080ffff",NULL,0));
  return 0;
}

displays 7fffffff instead of 8080ffff

changing strtol by strtoul fixes the overflow problems.


This break some mime detections, see this bug report about iso detection on amd64 :
http://bugzilla.gnome.org/show_bug.cgi?id=145956
https://bugzilla.ubuntu.com/show_bug.cgi?id=1221

This is because arc type use this mask:
      <match value="0x0000081a" type="little32" offset="0" mask="0x8080ffff"/>


Apparently the mime magic value has been adapted to give the right result after
the overflow, so fixing this bug breaks the mime detection for iso on 32bits
archs (the database need to be fixed too so). The other mimes using a mask
should probably be checked too.