Update USB.cpp
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@ -29,7 +29,7 @@
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#define USB_PRODUCT ARDUINO_BOARD
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#define USB_PRODUCT ARDUINO_BOARD
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#endif
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#endif
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#ifndef USB_SERIAL
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#ifndef USB_SERIAL
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#define USB_SERIAL ""
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#define USB_SERIAL "0"
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#endif
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#endif
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extern "C" {
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extern "C" {
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