enable make -j for multilibs

[Alexandre Oliva]

This patch enables GNU make's job server to work while building
newlib.  It needs $(MAKE) to appear explicitly in the command it
passes to the shell, otherwise it disables the job server, defeating
-j completely.  An alternative is to start the command with +, but
that's not as portable.  Ok to install?

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-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                 aoliva@{redhat.com, gcc.gnu.org}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist                Professional serial bug killer