Build fails with Bison 3.7 #77

Debian updated to Bison 3.7 and building Gecode 6.2.0 fails with it. The gecode/flatzinc/parser.tab.cpp file it generates has an #include "parser.tab.hpp" directive in it and since make renames parser.tab.hpp as parser.tab.hh, that fails.

I fixed it for Debian by adding this to the gecode/flatzinc/parser.tab.cpp target in Makefile.in:

sed -i 's/^#include "parser.tab.hpp"/#include "parser.tab.hh"/' gecode/flatzinc/parser.tab.cpp