tools/nolibc: Use linux/wait.h rather than duplicating it

Linux defines a few custom flags for waitpid() which aren't currently
provided by nolibc, make them available to nolibc based programs by just
including linux/wait.h where they are defined instead of defining our
own copy of the flags.
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

tools/include/nolibc/types.h

@@ -12,6 +12,7 @@
 #include <linux/reboot.h> /* for LINUX_REBOOT_* */
 #include <linux/stat.h>
 #include <linux/time.h>
+#include <linux/wait.h>
 
 
 /* Only the generic macros and types may be defined here. The arch-specific
@@ -108,9 +109,6 @@
 #define WTERMSIG(status)    ((status) & 0x7f)
 #define WIFSIGNALED(status) ((status) - 1 < 0xff)
 
-/* waitpid() flags */
-#define WNOHANG      1
-
 /* standard exit() codes */
 #define EXIT_SUCCESS 0
 #define EXIT_FAILURE 1