[Bug 246245] Mk/bsd.ccache.mk: Increase ccache hit ratio

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246245

--- Comment #11 from Ivan Rozhuk <rozhuk.im@gmail.com> ---
IMHO this part of work is done.


To improve ccache hit ratio there is 2 ways:

1. Always build at same path, this mean do not use port version/hash for dir
naming.

2. Step-by-step change outofsource build ports.
For cmake this means that in build dir we need create symlink to sources dir
and use this symlink as path to sources.

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