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pc, pc64: use softscreen double buffering for *bootscreen= framebuffer

it is probably almost always a good idea to use
double buffering with a unaccelerated framebuffer.

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

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

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

 void

 bootscreeninit(void)

 {

-	static Memdata md;

 	VGAscr *scr;

 	int x, y, z;

 	ulong chan, pa, sz;

@@ -622,9 +621,7 @@

 	if(memimageinit() < 0)

 		return;

-	md.ref = 1;

-	md.bdata = scr->vaddr;

-	gscreen = allocmemimaged(Rect(0,0,x,y), chan, &md);

+	gscreen = allocmemimage(Rect(0,0,x,y), chan);

 	if(gscreen == nil)

 		return;

@@ -632,8 +629,8 @@

 	scr->memdefont = getmemdefont();

 	scr->gscreen = gscreen;

 	scr->gscreendata = gscreen->data;

-	scr->softscreen = 0;

-	scr->useflush = 0;

+	scr->softscreen = 1;

+	scr->useflush = 1;

 	scr->dev = nil;

 	physgscreenr = gscreen->r;

@@ -640,6 +637,8 @@

 	vgaimageinit(chan);

 	vgascreenwin(scr);

+

+	drawcmap();

 	scr->cur = &vgasoftcur;

 	scr->cur->enable(scr);