CLSA-2026-1777663444 freerdp: Fix of 3 CVEs

CVE-2026-33985: fix information leak in ClearCodec glyph index decode; validate nWidthnHeight for overflow and update glyphEntry-count only after a successful realloc so subsequent reads cannot expose adjacent heap memory - CVE-2022-39283: fix missing length check in /video channel data handler;...