NoVoHT depends on assumptions about internal structure of fpos_t

[dmzimmerman]

I attempted to build on Mac OS X, using both clang and gcc, and ran into the following error:

novoht.cpp:426:37: error: member reference base type 'fpos_t' (aka 'long long')
      is not a structure or union
                fprintf(dbfile, "%ld,", plist->pos.__pos);

It appears that NoVoHT assumes that it knows something about the internal structure of "fpos_t" that apparently does not hold on Mac OS X. Since fpos_t is supposed to be an opaque data structure and its internals are not supposed to be depended upon, it would be good if there was an alternate method of doing whatever this part of the code is trying to do.

[kjbrandstatter]

probably implementation differences between clang and libc. can't help there being differences between library implementations of the same thing.