usr.bin/make phk's FIFO code for limiting instances of make

[Matthew Dillon]

:Matt,
:
:You said that you wanted to do the FIFO code import.  After the last
:set of patches are commited, the following patches are left.
:
:I also think we should just import the MAKE_SHELL, keeping them
:out just complicates the patch modifications that are needed to
:import things from FreeBSD.  Harti Brandt and I are cleaning up
:the code.  So hopefully, I can eventually isolate it later on.
:
:				Max

    Yah, I agree.

					-Matt