sanitiseHeaderPathsHook: init

C++ headers often use `__FILE__` in error messages, causing the
development outputs of libraries to leak into the runtime closure
of packages using them. This hook abstracts away a pattern used in
a few places throughout the tree to have headers identify themselves
by a sanitized path that does not cause runtime dependencies.

This does unfortunately mean that compiler error messages will
reference the sanitized path. The only alternatives I can imagine
are to patch compilers to handle `__FILE__` specially, or to have
libraries propagate a hook that removes references. The latter would
potentially need to be propagated recursively due to `#include`
semantics and would be less precise than this.

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