From: Geoffrey Wossum <geoffrey@pager.net>

Found a problem with the AVR32 optimized bzero() code.  Due to a
missing #include, it actually generated no code.

libc/string/avr32/bzero.S

@@ -6,6 +6,8 @@
  * archive for more details.
  */
 
+#include <features.h>
+
 #ifdef __UCLIBC_SUSV3_LEGACY__
 
        .text