-Werror,-Wgnu-folding-constant

> desktop/unx/source/start.c:788:23: error: variable length array folded to constant array as an extension [-Werror,-Wgnu-folding-constant]
>   788 |             char resp[strlen("InternalIPC::SendArguments") + 1];
>       |                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

since
<llvm/llvm-project@e4163c0>
"[clang] Emit bad shift warnings (#70307)" (and see the comments starting at
<llvm/llvm-project#70307 (comment)>
"[clang] Emit bad shift warnings" for how this new warning is indeed
intentional)

Change-Id: Ie439a0f5f6f3b256fa82ec3a05fdc5fb3b840715
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/170510
Reviewed-by: Stephan Bergmann <[email protected]>
Tested-by: Jenkins

Author: stbergmann

desktop/unx/source/start.c

@@ -785,7 +785,7 @@ SAL_IMPLEMENT_MAIN_WITH_ARGS(argc, argv)
         if ((fd=connect_pipe(pPipePath)) >= 0)
         {
             // Wait for answer
-            char resp[strlen("InternalIPC::SendArguments") + 1];
+            char resp[27]; // strlen("InternalIPC::SendArguments") + 1
             ssize_t n = read(fd, resp, SAL_N_ELEMENTS(resp));
             if (n == (ssize_t) SAL_N_ELEMENTS(resp) &&
                 (memcmp(resp, "InternalIPC::SendArguments",