Fix so novacomd works with new libusb-compat#1

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jdieter wants to merge 3 commits intoopenwebos:masterfrom

Commits on Apr 2, 2012

Use usb_bulk_[read|write] instead of homemade handlers. This allows us to
Jonathan Dieter
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Fix makefile so it respects environmental CFLAGS
Jonathan Dieter
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Remove unused 'err' variable
Jonathan Dieter
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