tests: remove the not used t_exec_callee

programs/tests/CMakeLists.txt

@@ -15,7 +15,6 @@ set(TEST_LIST
     t_sigmask.c
     t_getenv.c
     t_sigusr.c
-    t_exec_callee.c
     t_shmget.c
     t_stopcont.c
     t_semop.c

programs/tests/t_exec_callee.c

@@ -1,18 +0,0 @@
-/// @file t_exec_callee.c
-/// @brief
-/// @copyright (c) 2014-2024 This file is distributed under the MIT License.
-/// See LICENSE.md for details.
-
-#include <stdlib.h>
-#include <stdio.h>
-
-int main(int argc, char *argv[])
-{
-    char *ENV_VAR = getenv("ENV_VAR");
-    if (ENV_VAR == NULL) {
-        printf("Failed to get env: `ENV_VAR`\n");
-        return 1;
-    }
-    printf("ENV_VAR = %s\n", ENV_VAR);
-    return 0;
-}