build-sys: add --with-debug-shell=PATH
Distributions may have selinux but not sushell or might need to set a custom debug shell. Defaults to /sbin/sushell if selinux is enabled, /bin/sh if not. [zj: Renamed --with-debugshelltty to --with-debug-tty, and added a line in output showing DEBUGSHELL and DEBUGTTY. I figure that debug shell is pretty useful, and I hope the extra line in configure status will draw attention to it.]
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