Add the beginning of support for kernel graphics to bootloader.

* Load a font file off disk to pass to kernel
* Expose a framebuffer to the kernel
* Currently the kernel just paints the screen red

src/boot/utility.h

@@ -1,14 +1,16 @@
 #include "console.h"
 #include <efi.h>
 #include <efilib.h>
+#include <stddef.h>
 
 #define UNUSED __attribute__((unused))
 
+size_t wstrlen(const CHAR16 *s);
 const CHAR16 *util_error_message(EFI_STATUS status);
 
 #define CHECK_EFI_STATUS_OR_RETURN(s, msg, ...) \
 	if (EFI_ERROR((s))) { \
-		con_printf(L"EFI_ERROR: " msg L": %s\n", ##__VA_ARGS__, util_error_message(s)); \
+		con_printf(L"ERROR: " msg L": %s\r\n", ##__VA_ARGS__, util_error_message(s)); \
 		return (s); \
 	}