libc: Move setjmp to libc folder

Now that setjmp() and longjmp() are compliant with the standard they can
be moved with the other libc files.

Change-Id: Iea3b91c34eb353ace5e171e72f331602d57774d5
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/lib/libc/libc.mk b/lib/libc/libc.mk
index 1276f5c..e1b5560 100644
--- a/lib/libc/libc.mk
+++ b/lib/libc/libc.mk
@@ -1,10 +1,10 @@
 #
-# Copyright (c) 2016-2018, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2016-2019, ARM Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
-LIBC_SRCS	:=	$(addprefix lib/libc/,	\
+LIBC_SRCS	:=	$(addprefix lib/libc/,		\
 			abort.c				\
 			assert.c			\
 			exit.c				\
@@ -25,5 +25,10 @@
 			strnlen.c			\
 			strrchr.c)
 
+ifeq (${ARCH},aarch64)
+LIBC_SRCS	+=	$(addprefix lib/libc/aarch64/,	\
+			setjmp.S)
+endif
+
 INCLUDES	+=	-Iinclude/lib/libc		\
 			-Iinclude/lib/libc/$(ARCH)	\