the user can just use ^OZ to toggle crlf per-file
• make most file extensions matching case-insensitively

patch by Florian Weimer

also reverts commitid 100634B2AF24C65307E and does the same there

+ various new or restyled acronyms
+ wtf: m-s, screen

other #warning later down, but the first one seems to have caused an error

(the answer is, of course (gah!), sysconf…)

being used (because it’s inaccessible to Makefile.am writers really)

also spotted by trnv3; will go away by switching to Mirtoconf anyway

(by closing all windows¹ or actively exiting jupp)

① no, we can’t continue opening another window once all are closed

crashes reported by trnv3 (Jeff Johnson) via IRC, thanks!

• popen is also used in portable utilities (here, jupp) so we cannot
  rely on being allowed to use 'sh -c -- "cmd"' so, unless permitted
  (by defining POPEN_SH_USE_DBLDASH or being MirBSD), if the command
  begins with ‘-’ or ‘+’ prefix a space (malloc/memcpy)
• GCC’s vfork warnings get annoying here, so factor vfork out into a
  static subroutine for the child case (error and parent cases stay)
• some code cleanup
• retain errno across error cleanup codepath (also in system)
• avoid compiler warnings due to broken execve(2) API, from mksh
• system.c is now const‑ and warning-clean

userspace to follow, with portable tools like ed(1) using 'sh -c " cmd"'
instead for pre-SUSv5 portability

fixes at least one Conditional jump or move depends on uninitialised value(s)
==4435==    at 0x13B506: saver (ufile.c:377)

(even though that DNS entry currently does not exist… until we found a
permanent new home that accepts SSL from MirBSD systems we reconvene,
unencrypted even if must be, for now on OFTC)

solve the SIGILL mystery: ud2 inserted by __builtin_trap() from standalone fortify-headers which OpenWrt add-ons to musl libc

the crash isn’t limited to ^V/Ins or Mac OSX; strlcpy(3) post-facto became
stricter in several operating environments, and some of them seem to be
trigger-happy and SIGILL on certain conditions (overlapping strings or
overlong length passed)

cf. commitid 10060511C57233FD224

commit c3fa7ceb04cb952a19cceb55bc4c430d2baaa6af
Author: mirabilos <m@mirbsd.org>
Date:   Fri Oct 30 01:28:22 2020 +0100

    this causes a bad whatis entry on Debian

 joe.1.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

commit 2b406113c20c8aeeb36e986769aad58e33afd94d
Author: mirabilos <m@mirbsd.org>
Date:   Fri Oct 30 01:41:32 2020 +0100

    this might untaint for Coverity

 b.c       |  2 +-
 charmap.c | 46 +++++++++++++++++++++++++---------------------
 2 files changed, 26 insertions(+), 22 deletions(-)

commit 72f95e31658079824c538d44cada65f7007010dc
Author: mirabilos <tg@mirbsd.de>
Date:   Fri Oct 30 02:13:03 2020 +0100

    this might fix a coverity memory overlapping change issue

    (cherry picked from commit 849bdad4)

 b.c     |  3 ++-
 queue.h | 10 ++++++++--
 2 files changed, 10 insertions(+), 3 deletions(-)

commit 954efb7261f6b7a9633878f676a85a6e46fd02da
Author: mirabilos <m@mirbsd.org>
Date:   Fri Oct 30 02:33:28 2020 +0100

    fix macro wrapping

    (fixup for commit 72f95e31658079824c538d44cada65f7007010dc)

 queue.h | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

commit 7c77f4b8874a16eb55f946a6f1337e7e30b6fa07 (HEAD -> master)
Author: mirabilos <m@mirbsd.org>
Date:   Fri Oct 30 02:42:18 2020 +0100

    fix SELinux deprecation warning

 selinux.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)