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Convert include over to SRCTOP

Description

Convert include over to SRCTOP

Use SRCTOP in place of .CURDIR/.. as appropriate. The hand-crafted
relative paths for the "links" option remain, though, since those are
relative to /usr/include/sys/<blah> not to the source tree.

Differential Revision: https://reviews.freebsd.org/D9932
Sponsored by: Netflix
Silence On: arch@ (twice)