sca: eclair: substitute deprecated service STD.emptrecd

The ECLAIR service STD.emptrecd (which checks for empty structures) is now
deprecated.
Use STD.anonstct (which checks for structures with no named
members, an UB in C99)

Based on a change by Nicola Vetrini in the Xen project:

https://lists.xenproject.org/archives/html/xen-changelog/2024-12/msg00125.html

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

Author: nashif

cmake/sca/eclair/ECL/toolchain.ecl

@@ -50,8 +50,8 @@ Variables\";
 -config=STD.emptinit,behavior={c18,GCC,specified}
 -doc_end
 -doc_begin="See Chapter \"6.19 Structures with No Members\" of "GCC_MANUAL"."
--config=STD.emptrecd,behavior={c99,GCC,specified}
--config=STD.emptrecd,behavior={c18,GCC,specified}
+-config=STD.anonstct,behavior={c99,GCC,specified}
+-config=STD.anonstct,behavior={c18,GCC,specified}
 -doc_end
 -doc="See Chapter \"6.18 Arrays of Length Zero\" of "GCC_MANUAL"."
 -config=STD.arayzero,behavior={c99,GCC,specified}