common: Move hang() to the same header as panic()

At present panic() is in the vsprintf.h header file. That does not seem
like an obvious choice for hang(), even though it relates to panic(). So
let's put hang() in its own header.

Signed-off-by: Simon Glass <sjg@chromium.org>
[trini: Migrate a few more files]
Signed-off-by: Tom Rini <trini@konsulko.com>

lib/zlib/zutil.c

@@ -6,6 +6,7 @@
 /* @(#) $Id$ */
 
 #include "zutil.h"
+#include <hang.h>
 
 #ifndef NO_DUMMY_DECL
 struct internal_state      {int dummy;}; /* for buggy compilers */
@@ -34,7 +35,7 @@ void z_error (m)
     char *m;
 {
 	fprintf(stderr, "%s\n", m);
-	hang ();
+	hang();
 }
 #endif