qsort tests: Verify N3322 functionality.

* modules/qsort: New file.
* doc/posix-functions/qsort.texi: Mention the new module.
* tests/test-qsort.c: New file.
* modules/qsort-tests: New file.

modules/qsort

@@ -0,0 +1,25 @@
+Description:
+Sorting an array.
+
+Status:
+obsolete
+
+Notice:
+This module is obsolete.
+
+Files:
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+
+Include:
+<stdlib.h>
+
+License:
+LGPLv2+
+
+Maintainer:
+all