[bison-3.8] Link error on HP-UX 11i

[Larkin Nickle]

Tested with GNU Bison 3.80. This happens with GCC or HP aCC. HP-UX 11i 
does not have strtol defined and this results in a link error.

  CCLD     src/bison
/usr/ccs/bin/ld: Unsatisfied symbols:
   strtof (first referenced in src/bison-counterexample.o) (code)
make[2]: *** [Makefile:4831: src/bison] Error 1