testsuite: Disable -fstack-protector* for some strub tests

In our distro builds, we test with
RUNTESTFLAGS='--target_board=unix\{,-fstack-protector-strong\}'
because SSP is something we use widely in the distribution.
4 new strub test FAIL with that option though, as can be
seen with a simple
make check-gcc check-g++ RUNTESTFLAGS='--target_board=unix\{,-fstack-protector-strong\} dg.exp=strub-O*'
- in particular, the expand dump
\[(\]call\[^\n\]*strub_leave.*\n\[(\]code_label
regexps see code_labels in there introduced for stack protector.

The following patch fixes it by using -fno-stack-protector for these
explicitly.

2023-12-11  Jakub Jelinek  <jakub@redhat.com>

	* c-c++-common/strub-O2fni.c: Add -fno-stack-protector to dg-options.
	* c-c++-common/strub-O3fni.c: Likewise.
	* c-c++-common/strub-Os.c: Likewise.
	* c-c++-common/strub-Og.c: Likewise.

gcc/testsuite/c-c++-common/strub-O2fni.c

 /* { dg-do compile } */
-/* { dg-options "-O2 -fstrub=strict -fdump-rtl-expand -fno-inline" } */
+/* { dg-options "-O2 -fstrub=strict -fdump-rtl-expand -fno-inline -fno-stack-protector" } */
 /* { dg-require-effective-target strub } */
 
 /* With -fno-inline, none of the strub builtins are inlined.  */

gcc/testsuite/c-c++-common/strub-O3fni.c

 /* { dg-do compile } */
-/* { dg-options "-O3 -fstrub=strict -fdump-rtl-expand -fno-inline" } */
+/* { dg-options "-O3 -fstrub=strict -fdump-rtl-expand -fno-inline -fno-stack-protector" } */
 /* { dg-require-effective-target strub } */
 
 /* With -fno-inline, none of the strub builtins are inlined.  */

gcc/testsuite/c-c++-common/strub-Og.c

 /* { dg-do compile } */
-/* { dg-options "-Og -fstrub=strict -fdump-rtl-expand" } */
+/* { dg-options "-Og -fstrub=strict -fdump-rtl-expand -fno-stack-protector" } */
 /* { dg-require-effective-target strub } */
 
 /* At -Og, without -fno-inline, we fully expand enter, but neither update nor

gcc/testsuite/c-c++-common/strub-Os.c

 /* { dg-do compile } */
-/* { dg-options "-Os -fstrub=strict -fdump-rtl-expand" } */
+/* { dg-options "-Os -fstrub=strict -fdump-rtl-expand -fno-stack-protector" } */
 /* { dg-require-effective-target strub } */
 
 /* At -Os, without -fno-inline, we fully expand enter, and also update.  The