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make: modifier to run realpath() on variable?

The next version of bmake will have a dependency on realpath()
so I'd like to be able to replace things like:

${.PARSEDIR:C,.*,cd & \&\& 'pwd',:sh}

which is expensive if you have to do it 200k times


to convert .PARSEDIR to an absolute path.
(if realpath fails, the value is not touched).

'A' (or 'a') for 'A'bsolute - but 'r' (or 'R') for 'realpath' might
work too.  

The patch is trivial - apart from picking a name.


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