CLSA-2026-1775148284 binutils: Fix of 3 CVEs

CVE-2025-66862: fix heap-buffer-overflow in gnuspecial in cplus-dem.c - CVE-2025-66863: fix SEGV in ddiscriminator in cp-demangle.c - CVE-2025-66865: fix stack overflow in dprintcomp in cp-demangle.c...