mach: Drop SNARF_ARGS macro

We're obtaining arguments from the stack differently, see init-first.c.

Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>

sysdeps/mach/sysdep.h

@@ -56,13 +56,6 @@
 /* This is not used on all machines.  */
 #endif
 
-/* Set variables ARGC, ARGV, and ENVP for the arguments
-   left on the stack by the microkernel.  */
-#ifndef SNARF_ARGS
-#define SNARF_ARGS(argc, argv, envp)
-#error SNARF_ARGS not defined by sysdeps/mach/MACHINE/sysdep.h
-#endif
-
 /* LOSE can be defined as the `halt' instruction or something
    similar which will cause the process to die in a characteristic
    way suggesting a bug.  */

sysdeps/mach/x86/sysdep.h

@@ -25,20 +25,6 @@
 
 #define LOSE asm volatile ("hlt")
 
-#define SNARF_ARGS(entry_sp, argc, argv, envp)				      \
-  do									      \
-    {									      \
-      char **p;								      \
-      argc = (int) *entry_sp;						      \
-      argv = (char **) (entry_sp + 1);					      \
-      p = argv;								      \
-      while (*p++ != NULL)						      \
-	;								      \
-      if (p >= (char **) argv[0])					      \
-	--p;								      \
-      envp = p;							      \
-    } while (0)
-
 #define STACK_GROWTH_DOWN
 
 /* Get the machine-independent Mach definitions.  */