alsa makefiles don't work with -jN where N > 1

[Lee Revell <rlrevell@joe-job.com>]

Subject says it all.  Here is the relevant section from the GNU make documentation:

`warning: jobserver unavailable: using -j1. Add `+' to parent make rule.'
        In order for make processes to communicate, the parent will pass
        information to the child. Since this could result in problems if
        the child process isn't actually a make, the parent will only do
        this if it thinks the child is a make. The parent uses the
        normal algorithms to determine this (see section 5.6.1 How the
        MAKEVariable Works). If the makefile is constructed such that
        the parent doesn't know the child is a make process, then the
        child will receive only part of the information necessary. In
        this case, the child will generate this warning message and
        proceed with its build in a sequential manner.

I believe this is because some of the rules in the makefile aren't make
commands, but rm -f's.  This always seemed dangerous and sloppy to me -
why does make need to rm -f anything?  Isn't this the whole point of
makefiles, so you don't have to rm -f your tree and rebuild every time
you change something? 

Lee



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