CLSA-2026-1777313322 vim: Fix of 3 CVEs

CVE-2021-4173: fix double free in Vim9 nested :def function definition - CVE-2022-3352: fix use-after-free when SpellFileMissing autocmd deletes the current buffer during spell file loading - CVE-2022-2343: fix heap buffer overflow in inscompladdinfercase when completing a long line with...

CLSA-2022-1671124583 Fix CVE(s): CVE-2022-4292

SECURITY UPDATE: Using freed memory after SpellFileMissing autocmd uses bwipe - debian/patches/CVE-2022-4292.patch: Bail out if the window no longer exists - CVE-2022-4292...