Compilation fix for gcc 3.4

Bookcase has a compilation problem with gcc 3.4. I believe that commenting line 121 in src/translators/btparse/err.h should fix it. That’s the line that has

     int k;

Change that to

/*     int k; */

At least, I think that fixes the problem. I’m still on Mandrake 10.0, that has gcc 3.3.