Remove all trampoline support. Add -Wtrampolines when

present. Remove symbols used for trampolines to make
	link fail if trampolines are present.

config.h.in

@@ -11,7 +11,6 @@
 
 #if defined (GRUB_UTIL) || !defined (GRUB_MACHINE)
 #include <config-util.h>
-#define NESTED_FUNC_ATTR
 #else
 /* Define if C symbols get an underscore after compilation. */
 #define HAVE_ASM_USCORE @HAVE_ASM_USCORE@
@@ -49,10 +48,4 @@
 
 #define RE_ENABLE_I18N 1
 
-#if defined(__i386__)
-#define NESTED_FUNC_ATTR __attribute__ ((__regparm__ (1)))
-#else
-#define NESTED_FUNC_ATTR
-#endif
-
 #endif