metag: fix toolchain compile

toolchain/gcc/patches/4.2.4/fix-compile-with-newer-gcc.patch

@@ -0,0 +1,42 @@
+diff -Nur gcc-4.2.4.orig/gcc/toplev.h gcc-4.2.4/gcc/toplev.h
+--- gcc-4.2.4.orig/gcc/toplev.h	2007-09-01 17:28:30.000000000 +0200
++++ gcc-4.2.4/gcc/toplev.h	2017-06-30 22:54:25.600188422 +0200
+@@ -150,38 +150,6 @@
+ /* Return true iff flags are set as if -ffast-math.  */
+ extern bool fast_math_flags_set_p	(void);
+ 
+-/* Return log2, or -1 if not exact.  */
+-extern int exact_log2                  (unsigned HOST_WIDE_INT);
+-
+-/* Return floor of log2, with -1 for zero.  */
+-extern int floor_log2                  (unsigned HOST_WIDE_INT);
+-
+-/* Inline versions of the above for speed.  */
+-#if GCC_VERSION >= 3004
+-# if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
+-#  define CLZ_HWI __builtin_clzl
+-#  define CTZ_HWI __builtin_ctzl
+-# elif HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONGLONG
+-#  define CLZ_HWI __builtin_clzll
+-#  define CTZ_HWI __builtin_ctzll
+-# else
+-#  define CLZ_HWI __builtin_clz
+-#  define CTZ_HWI __builtin_ctz
+-# endif
+-
+-extern inline int
+-floor_log2 (unsigned HOST_WIDE_INT x)
+-{
+-  return x ? HOST_BITS_PER_WIDE_INT - 1 - (int) CLZ_HWI (x) : -1;
+-}
+-
+-extern inline int
+-exact_log2 (unsigned HOST_WIDE_INT x)
+-{
+-  return x == (x & -x) && x ? (int) CTZ_HWI (x) : -1;
+-}
+-#endif /* GCC_VERSION >= 3004 */
+-
+ /* Functions used to get and set GCC's notion of in what directory
+    compilation was started.  */
+