acorn/acrnsys1: remove use of utf8.h

Author: Pernod70

src/mame/acorn/acrnsys1.cpp

@@ -46,7 +46,6 @@ Note that left-most digit is not wired up, and therefore will always be blank.
 #include "machine/timer.h"
 #include "imagedev/cassette.h"
 #include "speaker.h"
-#include "utf8.h"
 
 #include "acrnsys1.lh"
 
@@ -231,13 +230,13 @@ static INPUT_PORTS_START( acrnsys1 )
 
 	PORT_START("X6")
 	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("E") PORT_CODE(KEYCODE_E) PORT_CHAR('E')
-	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME(UTF8_UP) PORT_CODE(KEYCODE_UP) PORT_CHAR('^')
+	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME(u8"\u2191") PORT_CODE(KEYCODE_UP) PORT_CHAR('^') // U+2191 = ↑
 	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("6") PORT_CODE(KEYCODE_6) PORT_CHAR('6')
 	PORT_BIT(0xc7, IP_ACTIVE_LOW, IPT_UNUSED)
 
 	PORT_START("X7")
 	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F") PORT_CODE(KEYCODE_F) PORT_CHAR('F')
-	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME(UTF8_DOWN) PORT_CODE(KEYCODE_DOWN) PORT_CHAR('V')
+	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME(u8"\u2193") PORT_CODE(KEYCODE_DOWN) PORT_CHAR('V') // U+2193 = ↓
 	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("7") PORT_CODE(KEYCODE_7) PORT_CHAR('7')
 	PORT_BIT(0xc7, IP_ACTIVE_LOW, IPT_UNUSED)