[metal] Make deathstar.com draw onto both VGA and serial consoles (#955)

In addition, deathstar.com can now be booted up via UEFI.

tool/viz/deathstar.c

@@ -15,6 +15,9 @@
 #define FRAMERATE 23.976
 #define WRITE(s)  write(1, s, strlen(s))
 
+__static_yoink("vga_console");
+__static_yoink("EfiMain");
+
 struct Sphere {
   double cx, cy, cz, r;
 };

tool/viz/viz.mk

@@ -41,6 +41,7 @@ TOOL_VIZ_DIRECTDEPS =				\
 	LIBC_THREAD				\
 	LIBC_TIME				\
 	LIBC_TINYMATH				\
+	LIBC_VGA				\
 	LIBC_X					\
 	NET_HTTP				\
 	THIRD_PARTY_COMPILER_RT			\