Make sure the AVR compiler can actually link stuff
authorKeith Packard <keithp@keithp.com>
Thu, 10 Oct 2013 16:47:52 +0000 (09:47 -0700)
committerKeith Packard <keithp@keithp.com>
Thu, 10 Oct 2013 16:47:52 +0000 (09:47 -0700)
avr-gcc was broken for a while, causing all linking to fail. Check for
that and don't try to build avr bits in that case.

Signed-off-by: Keith Packard <keithp@keithp.com>

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