Print stack trace of every system call

-k option is used to print stack trace of every system call. To enable this option, ENABLE_STACKTRACE is needed to build strace (code is here). E.g.:

# strace -k ls
execve("/usr/bin/ls", ["ls"], 0x7ffe9c8243b8 /* 21 vars */) = 0
 > /usr/lib/libc-2.28.so(execve+0xb) [0xc898b]
 > /usr/bin/strace(+0x0) [0xa25a4]
 > /usr/bin/strace(+0x0) [0xa40ad]
 > /usr/bin/strace(+0x0) [0x6f24c]
 > /usr/lib/libc-2.28.so(__libc_start_main+0xf3) [0x24223]
 > /usr/bin/strace(+0x0) [0x6fa7e]
brk(NULL)                               = 0x55d840fe5000
 > /usr/lib/ld-2.28.so(__brk+0xb) [0x1b26b]
 > /usr/lib/ld-2.28.so(_dl_sysdep_start+0x2f1) [0x19ef1]
 > /usr/lib/ld-2.28.so(_dl_start+0x288) [0x3088]
 > /usr/lib/ld-2.28.so() [0x2008]
......