Revert "Address Coverity CID 161765: Integer handling issues (SIGN_EXTENSION)."

This reverts commit 0ecdf682.

Bad patch, now these warnings are back:

../../libparse/binio.c: In function 'get_lsb_ulong':
../../libparse/binio.c:43:10: warning: conversion to 'long unsigned int' from 'int' may change the sign of the result [-Wsign-conversion]
   retval |= *((*bufpp)++) << 8;
          ^~
../../libparse/binio.c:44:10: warning: conversion to 'long unsigned int' from 'int' may change the sign of the result [-Wsign-conversion]
   retval |= *((*bufpp)++) << 16;
          ^~
../../libparse/binio.c:45:10: warning: conversion to 'long unsigned int' from 'int' may change the sign of the result [-Wsign-conversion]
   retval |= *((*bufpp)++) << 24;
          ^~