Commit 6e23562

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Fix MCUs without MPCM0 register

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Original file line number	Diff line number	Diff line change
`@@ -100,7 +100,11 @@ void HardwareSerial::_tx_udr_empty_irq(void)`
`100`	`100`	`// actually got written. Other r/w bits are preserved, and zeroes`
`101`	`101`	`// written to the rest.`
`102`	`102`
	`103`	`+#ifdef MPCM0`
`103`	`104`	`_ucsra = ((_ucsra) & ((1 << U2X0) \| (1 << MPCM0))) \| (1 << TXC0);`
	`105`	`+#else`
	`106`	`+ _ucsra = ((_ucsra) & ((1 << U2X0) \| (1 << TXC0)));`
	`107`	`+#endif`
`104`	`108`
`105`	`109`	`if (_tx_buffer_head == _tx_buffer_tail) {`
`106`	`110`	`// Buffer empty, so disable interrupts`
`@@ -236,7 +240,11 @@ size_t HardwareSerial::write(uint8_t c)`
`236`	`240`	`// be cleared when no bytes are left, causing flush() to hang`
`237`	`241`	`ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {`
`238`	`242`	`*_udr = c;`
	`243`	`+#ifdef MPCM0`
`239`	`244`	`_ucsra = ((_ucsra) & ((1 << U2X0) \| (1 << MPCM0))) \| (1 << TXC0);`
	`245`	`+#else`
	`246`	`+ _ucsra = ((_ucsra) & ((1 << U2X0) \| (1 << TXC0)));`
	`247`	`+#endif`
`240`	`248`	`}`
`241`	`249`	`return 1;`
`242`	`250`	`}`

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