esp8266: Disable "OS" debug output.

pfalcon · dpgeorge · commit 554292c5cfbd · 2016-08-09T23:51:15.000+10:00
diff --git a/esp8266/Makefile b/esp8266/Makefile
@@ -32,7 +32,7 @@ INC += -I$(ESP_SDK)/include
 
 # UART for "os" messages. 0 is normal UART as used by MicroPython REPL,
 # 1 is debug UART (tx only), -1 to disable.
-UART_OS = 0
+UART_OS = -1
 
 CFLAGS_XTENSA = -fsingle-precision-constant -Wdouble-promotion \
 	-D__ets__ -DICACHE_FLASH \
