Add patch-2.6.1, make-3.81, and diffutils-2.9

sys-apps/diffutils/patches/diffutils-2.9.patch

@@ -0,0 +1,14 @@
+diff -up diffutils-2.9/lib/verify.h.orig diffutils-2.9/lib/verify.h
+--- diffutils-2.9/lib/verify.h.orig	2010-04-18 13:06:04.590872576 -0600
++++ diffutils-2.9/lib/verify.h	2010-04-18 13:08:52.910163968 -0600
+@@ -135,6 +135,10 @@ template <int w>
+ /* Verify requirement R at compile-time, as a declaration without a
+    trailing ';'.  */
+ 
++# if __GNUC__ == 2
++# define verify(R)
++# else
+ # define verify(R) extern int (* verify_function__ (void)) [verify_true (R)]
++# endif
+ 
+ #endif