CLSA-2026-1778260679 vim: Fix of 7 CVEs

CVE-2021-3875: fix mlget error after search with range; clamp ea-line2 to the buffer length in getaddress so out-of-range addresses do not produce an out-of-bounds read exdocmd.c, upstream patch 8.2.3489 - CVE-2022-4293: fix crash when dividing the largest negative integer by -1 in numdivide;...