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games/doom: fix white window issue on exit

make kbdproc() and mouseproc() share fd table with the main proc
and not explicitely close the file descriptors. so /dev/mouse gets
closed *after* /dev/draw/new to avoid the white window refresh issue.

--- a/sys/src/games/doom/i_video.c

+++ b/sys/src/games/doom/i_video.c

@@ -46,13 +46,13 @@

 	center = addpt(screen->r.min, Pt(Dx(screen->r)/2, Dy(screen->r)/2));

 	grabout = insetrect(screen->r, Dx(screen->r)/8);

-	if((pid = rfork(RFPROC|RFMEM|RFFDG)) == 0){

+	if((pid = rfork(RFPROC|RFMEM)) == 0){

 		kbdproc();

 		exits(nil);

 	}

 	kbdpid = pid;

-	if((pid = rfork(RFPROC|RFMEM|RFFDG)) == 0){

+	if((pid = rfork(RFPROC|RFMEM)) == 0){

 		mouseproc();

 		exits(nil);

 	}

@@ -300,7 +300,6 @@

 		}

 		strcpy(buf2, buf);

 	}

-	close(kfd);

 }

 static void

@@ -356,6 +355,5 @@

 			break;

 		}

 	}

-	close(fd);

 }