Fix include directory usage requirement for build tree
The include directory usage requirement for the build tree was added by commit 993f0ea4 (Add an option to split object and interface libs, 2017-06-19) and preserved by commit b61faf89 (Fix install rules and usage requirements for interface+object libs, 2017-06-28). However, its value should be that of `KWSYS_HEADER_ROOT` rather than just its default.
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