feat(libc): import qsort implementation

Import qsort implementation from FreeBSD[1] to libc.

[1]: https://cgit.freebsd.org/src/tree/lib/libc/stdlib/qsort.c

Change-Id: Ia0d8e2d1c40c679844c0746db1b669cda672a482
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
diff --git a/lib/libc/libc_common.mk b/lib/libc/libc_common.mk
index 4879818..5f44bd5 100644
--- a/lib/libc/libc_common.mk
+++ b/lib/libc/libc_common.mk
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2024, Arm Limited and Contributors. All rights reserved.
+# Copyright (c) 2024-2025, Arm Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -17,6 +17,7 @@
 			printf.c			\
 			putchar.c			\
 			puts.c				\
+			qsort.c				\
 			snprintf.c			\
 			strchr.c			\
 			strcmp.c			\