I am adjusting Makefile.inc1 to handle this automatically. All we
need to do (I think) is to force [f]lex to use the bootstrap m4 instead
of /usr/bin/m4, which can be done with an environment variable.
I will also fix some parallel build issues regarding m4 and other
source modules in the bootstrap utils directory list which have to
directly or indirectly execute it.
Commit will occur in ~30 min or so if my tests finish without error.
-Matt
