m68k: add some patches for newer gcc/linux

target/linux/patches/4.6.4/macsonic.patch

@@ -0,0 +1,11 @@
+diff -Nur linux-4.4.6.orig/drivers/net/ethernet/natsemi/Kconfig linux-4.4.6/drivers/net/ethernet/natsemi/Kconfig
+--- linux-4.4.6.orig/drivers/net/ethernet/natsemi/Kconfig	2016-03-16 16:43:17.000000000 +0100
++++ linux-4.4.6/drivers/net/ethernet/natsemi/Kconfig	2016-03-18 10:43:34.000000000 +0100
+@@ -18,6 +18,7 @@
+ config MACSONIC
+ 	tristate "Macintosh SONIC based ethernet (onboard, NuBus, LC, CS)"
+ 	depends on MAC
++	select BITREVERSE
+ 	---help---
+ 	  Support for NatSemi SONIC based Ethernet devices.  This includes
+ 	  the onboard Ethernet in many Quadras as well as some LC-PDS,

toolchain/gcc/patches/6.1.0/fix-m86k-libgcc.patch

@@ -0,0 +1,11 @@
+diff -Nur gcc-4.9.3.orig/libgcc/config/m68k/linux-atomic.c gcc-4.9.3/libgcc/config/m68k/linux-atomic.c
+--- gcc-4.9.3.orig/libgcc/config/m68k/linux-atomic.c	2014-01-02 23:25:22.000000000 +0100
++++ gcc-4.9.3/libgcc/config/m68k/linux-atomic.c	2015-11-29 14:42:10.566143595 +0100
+@@ -33,7 +33,6 @@
+    using the kernel helper defined below.  There is no support for
+    64-bit operations yet.  */
+ 
+-#include <asm/unistd.h>
+ #include <stdbool.h>
+ 
+ #ifndef __NR_atomic_cmpxchg_32