CLSA-2025-1738170565 vim: Fix of 5 CVEs

CVE-2023-2610: limit the text length to MAXCOL - CVE-2023-4735: don't overflow buf2, check size in for loop - CVE-2023-4750: check buffer is valid before accessing it - CVE-2023-4752: validate buffer before accessing it - CVE-2023-4781: disallow exchanging windows when textlock is active - Drop...