[bitc-dev] [Patch] automatic setting of Option::SystemDirs

[Thomas Kuehne]

The attached patch adds the system dir (based on the executable's 
path) to Option::SystemDirs if SystemDirs wasn't set explicitly 
via --system.

e.g.
executable location: /usr/local/bin/bitcc
system dir: /usr/local

It should work on all glibc based systems and POSIX.1-2008 compliant 
ones. On other *nix based systems and Windows/Vista the patch should 
compile but doesn't change SystemDirs.

Thomas
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