[PATCH] man: let the user specify the format command

[Alastair Hughes]

Package: busybox
Version: v1.25.1
Severity: wishlist

The attached patch lets the user configure the command used to format man pages by busybox's man.
I'm using heirloom-doctools instead of groff in a toy distro, which doesn't provide gtbl (just tbl) and doesn't work with -Tascii (I use -Tutf8 instead), so I am using this to let me view man pages.
I think that it would also be useful if busybox was built without seamless decompression - the command could pipe the man page through gunzip before sending it on.

I've tested this by building with the defaults, with a changed command, and without man.

Regards,
Alastair Hughes
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