nightly should check assembler version via makefile, same as compiler
right now, nightly assumes the assembler is 'as' and that 'as -V' will work. In the case of the GNU assembler, neither is true (gas -V waits for input on stdin.)
We should check the version via usr/src/Makefile as we do for cc, CC and javac.
(but see a follow-up regarding aw being broken)
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