testsuites/libtests: Added quick_exit tests

Added the tests for quick_exit() and
at_quick_exit() in textsuits/libtests/exit04

spec/build/testsuites/libtests/exit04.yml

@@ -0,0 +1,19 @@
+SPDX-License-Identifier: CC-BY-SA-4.0 OR BSD-2-Clause
+build-type: test-program
+cflags: []
+copyrights:
+- Copyright (C) 2025 Mazen Adel Elmessady
+cppflags: []
+cxxflags: []
+enabled-by: true
+features: c cprogram
+includes: []
+ldflags: []
+links: []
+source:
+- testsuites/libtests/exit04/init.c
+stlib: []
+target: testsuites/libtests/exit04.exe
+type: build
+use-after: []
+use-before: []

spec/build/testsuites/libtests/grp.yml

@@ -124,6 +124,8 @@ links:
   uid: exit02
 - role: build-dependency
   uid: exit03
+- role: build-dependency
+  uid: exit04
 - role: build-dependency
   uid: fcntl
 - role: build-dependency