m68k: add private libgcc

Add private libgcc

Signed-off-by: Angelo Dureghello <angelo@sysam.it>
diff --git a/arch/Kconfig b/arch/Kconfig
index 6489cc9..1709d40 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -40,6 +40,7 @@
 
 config M68K
 	bool "M68000 architecture"
+	select HAVE_PRIVATE_LIBGCC
 	select HAVE_GENERIC_BOARD
 	select SYS_GENERIC_BOARD