cmd: Fix license command

The license command isn't usually built and has a few problems:
- The rules to generate license.h haven't worked in a long time,
  re-write these based on the bmp_logo.h rules.
- 'tok' is unused and the license text size has increased
- bin2header.c wasn't grabbing unistd.h to know the prototype for
  read().

Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Tom Rini <trini@konsulko.com>

cmd/license.c

@@ -7,7 +7,7 @@
 
 #include <common.h>
 
-/* COPYING is currently 15951 bytes in size */
+/* Licenses/gpl-2.0.txt is currently 18092 bytes in size */
 #define LICENSE_MAX	20480
 
 #include <command.h>
@@ -16,13 +16,13 @@
 
 int do_license(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
-	char *tok, *dst = malloc(LICENSE_MAX);
+	char *dst = malloc(LICENSE_MAX);
 	unsigned long len = LICENSE_MAX;
 
 	if (!dst)
 		return -1;
 
-	if (gunzip(dst, LICENSE_MAX, license_gz, &len) != 0) {
+	if (gunzip(dst, LICENSE_MAX, license_gzip, &len) != 0) {
 		printf("Error uncompressing license text\n");
 		free(dst);
 		return -1;