Log Message:
Export a new variable TOOLS_CMDLINE_<TOOL> that holds the full command
line (path and arguments) needed to run the real tool.

Modify TOOLS_<TOOL> to hold only the path to the real tool.

Modify falcons-eye/Makefile and qt3-libs/Makefile.common to use
TOOLS_CMDLINE_YACC instead of TOOLS_YACC to that they'll use "bison -y".