Fix Compile error for Teensy LC

teensy3/serial2.c

 	while (transmitting) yield();  // wait for buffered data to send
 	NVIC_DISABLE_IRQ(IRQ_UART1_STATUS);
 	UART1_C2 = 0;
+#if defined(KINETISK)
 	switch (rx_pin_num) {
 		case 9: CORE_PIN9_CONFIG = PORT_PCR_PE | PORT_PCR_PS | PORT_PCR_MUX(1); break; // PTC3
 		#if !(defined(__MK64FX512__) || defined(__MK66FX1M0__))  // not on T3.5 or T3.6
 		case 31: CORE_PIN31_CONFIG = PORT_PCR_PE | PORT_PCR_PS | PORT_PCR_MUX(1); break; // PTE0
 		#endif
 	}
+#elif defined(KINETISL)
+	CORE_PIN9_CONFIG = PORT_PCR_PE | PORT_PCR_PS | PORT_PCR_MUX(1);  // PTC3
+	CORE_PIN10_CONFIG = PORT_PCR_PE | PORT_PCR_PS | PORT_PCR_MUX(1); // PTC4
+#endif
 	rx_buffer_head = 0;
 	rx_buffer_tail = 0;
 	if (rts_pin) rts_deassert();