CLSA-2026-1774438942 freerdp: Fix of 3 CVEs

CVE-2026-29774: heap buffer overflow in H.264 AVC420/AVC444 YUV-to-RGB conversion - CVE-2026-31884: division by zero in ADPCM decoders when nBlockAlign is 0 - CVE-2026-29775: off-by-one in bitmapcacheput...