sh: Add do-nothing -h option.

POSIX requires a -h option to sh and set, to locate and remember utilities
invoked by functions as they are defined. Given that this
locate-and-remember process is optional elsewhere, it seems safe enough to
make this option do nothing.

POSIX does not specify a long name for this option. Follow ksh in calling it
"trackall".

bin/sh/options.h

@@ -62,8 +62,9 @@ struct shparam {
 #define	privileged optlist[15].val
 #define	Tflag optlist[16].val
 #define	Pflag optlist[17].val
+#define	hflag optlist[18].val
 
-#define NOPTS	18
+#define NOPTS	19
 
 struct optent {
 	const char *name;
@@ -91,6 +92,7 @@ struct optent optlist[NOPTS] = {
 	{ "privileged",	'p',	0 },
 	{ "trapsasync",	'T',	0 },
 	{ "physical",	'P',	0 },
+	{ "trackall",	'h',	0 },
 };
 #else
 extern struct optent optlist[NOPTS];

bin/sh/sh.1

@@ -32,7 +32,7 @@
 .\"	from: @(#)sh.1	8.6 (Berkeley) 5/4/95
 .\" $FreeBSD$
 .\"
-.Dd June 17, 2011
+.Dd June 18, 2011
 .Dt SH 1
 .Os
 .Sh NAME
@@ -241,6 +241,10 @@ tested, all commands of the function are considered to be tested as
 well.
 .It Fl f Li noglob
 Disable pathname expansion.
+.It Fl h Li trackall
+A do-nothing option for
+.Tn POSIX
+compliance.
 .It Fl I Li ignoreeof
 Ignore
 .Dv EOF Ap s