[variadic][eacsl] Update tests

src/plugins/e-acsl/tests/builtin/oracle_ci/gen_strcmp.c

src/plugins/variadic/tests/erroneous/oracle/exec.res.oracle

...plugins/variadic/tests/erroneous/oracle/printf.res.oracle

src/plugins/variadic/tests/known/oracle/exec.res.oracle

src/plugins/variadic/tests/known/oracle/fcntl.res.oracle

src/plugins/variadic/tests/known/oracle/open.res.oracle

...plugins/variadic/tests/known/oracle/open_wrong.res.oracle

src/plugins/variadic/tests/known/oracle/openat.res.oracle

src/plugins/variadic/tests/known/oracle/printf.res.oracle

...variadic/tests/known/oracle/printf_wrong_arity.res.oracle

...lugins/variadic/tests/known/oracle/stdio_print.res.oracle

...plugins/variadic/tests/known/oracle/stdio_scan.res.oracle