fix issue reported by covscan

CVE-2022-1785 vim: Out-of-bounds Write
CVE-2022-1897 vim: out-of-bounds write in vim_regsub_both() in regexp.c
CVE-2022-1927 vim: buffer over-read in utf_ptr2char() in mbyte.c

CVE-2022-1621 vim: heap buffer overflow
CVE-2022-1629 vim: buffer over-read

CVE-2022-1154 vim: use after free in utf_ptr2char

CVE-2022-0361 vim: Heap-based Buffer Overflow in GitHub repository

CVE-2022-0392 vim: heap-based buffer overflow in getexmodeline() in ex_getln.c
CVE-2022-0413 vim: use after free in src/ex_cmds.c

fix test suite after fix for CVE-2022-0318
CVE-2022-0359 vim: heap-based buffer overflow in init_ccline() in ex_getln.c

CVE-2022-0261 vim: Heap-based Buffer Overflow in block_insert() in src/ops.c
CVE-2022-0318 vim: heap-based buffer overflow in utf_head_off() in mbyte.c

CVE-2021-4193 vim: vulnerable to Out-of-bounds Read
CVE-2021-4192 vim: vulnerable to Use After Free

2028341 - CVE-2021-3984 vim: illegal memory access when C-indenting could lead to Heap Buffer Overflow [rhel-8.6.0]
2028430 - CVE-2021-4019 vim: heap-based buffer overflow in find_help_tags() in src/help.c [rhel-8.6.0]

2016201 - CVE-2021-3872 vim: heap-based buffer overflow in win_redr_status() drawscreen.c [rhel-8.6.0]

2004975 - CVE-2021-3796 vim: use-after-free in nv_replace() in normal.c [rhel-8.6.0]
2004892 - CVE-2021-3778 vim: heap-based buffer overflow in utf_ptr2char() in mbyte.c [rhel-8.6.0]

1842755 - CVE-2019-20807

1745476 - manpage of vim is garbled in Japanese locale

fixing covscan issues raised by previous commit

1605095 - vim: should not re-implement crypto