tools/lib/subcmd: Replace NORETURN usage with __noreturn

NORETURN is redundant with __noreturn, just use the latter.

Reviewed-by: Miroslav Benes <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Josh Poimboeuf <[e-mail]>

tools/lib/subcmd/parse-options.h

···
 #include <stdbool.h>
 #include <stdint.h>
 
-#ifndef NORETURN
-#define NORETURN __attribute__((__noreturn__))
-#endif
-
 enum parse_opt_type {
 	/* special types */
 	OPTION_END,
···
 				const char *const subcommands[],
 				const char *usagestr[], int flags);
 
-extern NORETURN void usage_with_options(const char * const *usagestr,
+extern __noreturn void usage_with_options(const char * const *usagestr,
                                         const struct option *options);
-extern NORETURN __attribute__((format(printf,3,4)))
+extern __noreturn __attribute__((format(printf,3,4)))
 void usage_with_options_msg(const char * const *usagestr,
 			    const struct option *options,
 			    const char *fmt, ...);

tools/lib/subcmd/subcmd-util.h

···
 #include <stdarg.h>
 #include <stdlib.h>
 #include <stdio.h>
-
-#define NORETURN __attribute__((__noreturn__))
+#include <linux/compiler.h>
 
 static inline void report(const char *prefix, const char *err, va_list params)
 {
···
 	fprintf(stderr, " %s%s\n", prefix, msg);
 }
 
-static NORETURN inline void die(const char *err, ...)
+static __noreturn inline void die(const char *err, ...)
 {
 	va_list params;