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aux/aout2uimage: add a flag to override ostype (lie about not being plan9)

uboot can be so broken, that it becomes necessary to
masquerade as a linux kernel for anything to work,
so add a flag where the ostype can be set.

--- a/sys/src/cmd/aux/aout2uimage.c

+++ b/sys/src/cmd/aux/aout2uimage.c

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

 int infd, outfd;

 ulong dcrc;

 ulong *tab;

+ulong lie = 23;	/* plan9 */

 uchar buf[65536];

 enum {

@@ -67,7 +68,7 @@

 void

 usage(void)

 {

-	fprint(2, "usage: %s a.out\n", argv0);

+	fprint(2, "usage: %s [-o outfile] [-Z kzero] [-l ostype] a.out\n", argv0);

 	exits("usage");

 }

@@ -109,6 +110,7 @@

 	ofile = nil;

 	ARGBEGIN {

 	case 'Z': kzero = strtoull(EARGF(usage()), 0, 0); break;

+	case 'l': lie = strtoul(EARGF(usage()), 0, 0); break;

 	case 'o': ofile = strdup(EARGF(usage())); break;

 	default: usage();

 	} ARGEND;

@@ -152,7 +154,7 @@

 	put(&header[16], fhdr.txtaddr - kzero); /* load address */

 	put(&header[20], fhdr.entry - kzero); /* entry point */

 	put(&header[24], dcrc); /* data crc */

-	header[28] = 23; /* os = plan 9 */

+	header[28] = lie;

 	header[29] = arch;

 	header[30] = 2; /* type = kernel */

 	header[31] = 0; /* compressed = no */

-- 

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