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sgi: disable graphical arcs console printing on screen modeset

when we switch to graphics mode, we do not want graphical arcs console
to print on the screen anymore as it assumes 8bit color mode and just
messes up the screen on kernel prints.

--- a/sys/src/9/sgi/screen.c

+++ b/sys/src/9/sgi/screen.c

@@ -445,6 +445,7 @@

 };

 Memimage *gscreen;

+static Point curoff;

 static void 

 vc2set(uchar r, ushort val)

@@ -465,7 +466,6 @@

 	return regs->dcbdata0 >> 16;

 }

-static Point curoff;

 void

 cursoron(void)

@@ -556,8 +556,15 @@

 	regs->drawmode1 = DM1_RGBPLANES | 

 		NPORT_DMODE1_CCLT | NPORT_DMODE1_CCEQ | NPORT_DMODE1_CCGT | NPORT_DMODE1_LOSRC |

 		NPORT_DMODE1_DD24 | NPORT_DMODE1_RGBMD | NPORT_DMODE1_HD32 | NPORT_DMODE1_RWPCKD;

+}

-	setcursor(&arrow);

+static void

+arcsoff(void)

+{

+	if(consuart != nil && consuart->console && strcmp(consuart->name, "arcs") == 0){

+		consuart = nil;

+		serialoq = nil;

+	}

 }

 void

@@ -573,6 +580,7 @@

 	s = splhi();

 	if(!modeset){

 		modeset = 1;

+		arcsoff();

 		setmode();

 	}

@@ -613,7 +621,11 @@

 	*d = gscreen->depth;

 	*chan = gscreen->chan;

 	*width = gscreen->width;

-	*softscreen = 1;

+

+	/* make devdraw use gscreen->data */

+	*softscreen = 0xa110c;

+	gscreen->data->ref++;

+

 	return gscreen->data->bdata;

 }