generic: Add support for 2.6.39

Add support for 2.6.39 based on rc3. Runtime tested on bcm63xx.

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@26615 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/generic/patches-2.6.39/903-stddef_include.patch

@@ -0,0 +1,17 @@
+--- a/include/linux/stddef.h
++++ b/include/linux/stddef.h
+@@ -16,6 +16,7 @@ enum {
+ 	false	= 0,
+ 	true	= 1
+ };
++#endif /* __KERNEL__ */
+ 
+ #undef offsetof
+ #ifdef __compiler_offsetof
+@@ -23,6 +24,5 @@ enum {
+ #else
+ #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
+ #endif
+-#endif /* __KERNEL__ */
+ 
+ #endif