hppa/bits/atomic.h: include errno.h to get EFAULT/ENOSYS

Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

libc/sysdeps/linux/hppa/bits/atomic.h

@@ -18,6 +18,7 @@
    02111-1307 USA.  */
 
 #include <stdint.h>
+#include <errno.h>
 #include <bits/kernel-features.h>
 
 #define ABORT_INSTRUCTION __asm__(__UCLIBC_ABORT_INSTRUCTION__)