mdbx-test: output the signal name if killed/coredumped.

Change-Id: I51e70daf89149ecbe72924fc9f105ea072574a23

.github/actions/spelling/expect.txt

@@ -2,6 +2,7 @@ aarch
 abcdef
 abf
 abra
+ABRT
 abstime
 ACI
 acision
@@ -32,6 +33,7 @@ allones
 ALLPOSTMESSAGE
 allthrough
 alphabase
+ALRM
 altlinux
 AMAX
 amd
@@ -159,6 +161,7 @@ CHECKOWNER
 CHECKPID
 chipitsine
 chk
+CHLD
 chrono
 ci
 cifs
@@ -1426,6 +1429,7 @@ searchdata
 SEARCHENGINE
 sebastien
 segfault
+SEGV
 sema
 sembuf
 semctl
@@ -1459,23 +1463,45 @@ showinitializer
 showned
 shrinked
 sideeffect
+SIGABRT
 sigaction
 sigaddset
 sigalarm
 SIGALRM
+SIGBUS
 SIGCHLD
+SIGCONT
 sigemptyset
+SIGEMT
+SIGFPE
 SIGHUP
 SIGINT
+SIGIO
 SIGKILL
 sigmask
 SIGPIPE
+SIGPOLL
 sigprocmask
+SIGPROF
+SIGPWR
+SIGQUIT
 SIGSEGV
 sigset
+SIGSTKFLT
+SIGSTOP
+SIGSYS
 SIGTERM
+SIGTRAP
+SIGTSTP
+SIGTTIN
+SIGTTOU
+SIGURG
 sigusr
+SIGVTALRM
 sigwait
+SIGWINCH
+SIGXCPU
+SIGXFSZ
 singlemode
 singleprocess
 sizeof
@@ -1542,6 +1568,7 @@ stdio
 stdlib
 stdout
 stepbystep
+STKFLT
 storz
 stoull
 strcasecmp
@@ -1671,8 +1698,11 @@ trywait
 tsan
 tsd
 tsize
+TSTP
 ttf
+TTIN
 ttl
+TTOU
 TVvqnwctdis
 tw
 twistylittlepassagesallalike
@@ -1730,6 +1760,7 @@ updation
 upsert
 UPSERTING
 upsertion
+URG
 url
 usec
 usedbytes
@@ -1782,6 +1813,7 @@ vromanov
 Vrq
 vscprintf
 vsnprintf
+VTALRM
 vvn
 vvnw
 vvv
@@ -1844,6 +1876,7 @@ WSL
 wsl
 wstr
 wstring
+WTERMSIG
 WUNTRACED
 www
 WX
@@ -1852,10 +1885,12 @@ xappend
 xargs
 xcode
 XCONCAT
+XCPU
 xcursor
 xdata
 xf
 xflags
+XFSZ
 xhtml
 xkeep
 XLB